Top fuel dragsters and funny cars burn nitromethane as fuel according to the following
balanced combustion equation:
2CH3NO2 (1) + O2(g) → 2CO₂(g) + 3H₂O(1) + N2(g), Hrxn= -1418 kJ
The standard enthalpies of formation are -393.5 kJ/mol for CO2 (g) and -285.8
kJ/mol for H₂O(l)
Calculate the standard enthalpy of formation (Hf) for nitromethane.
Answers
-227.3 kJ/mol.
To calculate the standard enthalpy of formation (ΔHf) of nitromethane, we need to use Hess's Law, which states that the total enthalpy change during a chemical reaction is independent of the pathway between the initial and final states. In other words, if we can find a series of reactions whose enthalpy changes add up to the enthalpy change of the desired reaction, we can use them to calculate ΔHf.
First, let's write the combustion equation in terms of the standard enthalpies of formation:
ΔHrxn = ΣnΔHf(products) - ΣnΔHf(reactants)
where n is the stoichiometric coefficient of each compound in the balanced chemical equation.
Substituting the standard enthalpies of formation of CO2 and H2O into the equation, we get:
-1418 kJ/mol = 2ΔHf(CO2) + 3ΔHf(H2O) + ΔHf(N2) - 2ΔHf(CH3NO2)
(From these standard enthalpies given)
ΔHf(CO2) = -393.5 kJ/mol
ΔHf(H2O) = -285.8 kJ/mol
ΔHf(N2) = 0 kJ/mol
Now we need to solve for ΔHf(CH3NO2):
-1418 kJ/mol = 2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) + 0 kJ/mol - 2ΔHf(CH3NO2)
ΔHf(CH3NO2) = [2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) - 1418 kJ/mol]/2
= -227.3 kJ/mol
Therefore, the standard enthalpy of formation of nitromethane is -227.3 kJ/mol. This means that if one mole of nitromethane is formed from its elements in their standard states at a temperature of 25°C and a pressure of 1 atm, -227.3 kJ of heat will be absorbed by the system.
In simpler terms, the energy required to form one mole of nitromethane from its elements is -227.3 kJ/mol.
Nitromethane has a standard enthalpy of production of -490.2 kJ/mol.
Is nitromethane a more rapid combustion than gasoline?Nitromethane fuel may be used in one run 8.6 times more frequently than gasoline for a given cylinder volume. This indicates that using nitromethane instead of gasoline and the same amount of air results in around 2.3 times higher power.
We may get the standard enthalpy of production of nitromethane by using the values for the products and reactants' standard enthalpies of formation:
ΔHf° = Σ(nΔHf° products) - Σ(nΔHf° reactants)
ΔHf° for CO2(g) = -393.5 kJ/mol
ΔHf° for H2O(l) = -285.8 kJ/mol
ΔHf° for N2(g) = 0 kJ/mol
ΔHf° for O2(g) = 0 kJ/mol
The values in the formula above can be changed as follows:
ΔHf° for CH3NO2 = [2(-393.5 kJ/mol) + 3(-285.8 kJ/mol) + 1(0 kJ/mol)] - [2ΔHf° for CH3NO2 + 1(0 kJ/mol)]
If we simplify, we get:
ΔHf° for CH3NO2 = -1418 kJ/mol - 6(-285.8 kJ/mol) + 2(-393.5 kJ/mol)
ΔHf° for CH3NO2 = -1418 kJ/mol + 1714.8 kJ/mol - 787 kJ/mol
ΔHf° for CH3NO2 = -490.2 kJ/mol
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Related Questions
what is the pressure in a region of outer space where there is 1 molecule/cm3 and the temperature is 3 k?
Answers
The pressure in a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K would be 3.91 x 10^-23 Pa.
Ideal gas problemIn a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K, we can use the ideal gas law to calculate the pressure. However, it is important to note that the ideal gas law assumes that the gas molecules are in constant motion and interact with each other through perfectly elastic collisions, which may not be entirely accurate for outer space conditions.
The ideal gas law is given by:
PV = nRT
where P is the pressure in pascals (Pa), V is the volume in cubic meters (m3), n is the number of moles of gas, R is the gas constant (8.314 J/(mol·K)), and T is the temperature in Kelvin (K).
We are given that there is 1 molecule/cm3 in this region of outer space. This can be converted to the number of moles of gas using Avogadro's number:
1 molecule/cm3 = 1.66 x 10^-24 mol/m3
The volume can be assumed to be very large since we are in outer space, so we can approximate it as infinity (i.e., V = ∞).
Now we can plug in the values:
PV = nRT
P(∞) = (1.66 x 10^-24)(8.314)(3)
P = 3.91 x 10^-23 Pa
Therefore, the pressure in a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K is approximately 3.91 x 10^-23 Pa.
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What is the oxidation number of manganese (Mn) in potassium permanganate (KMnO4)?+5, +7, +8, +9
Answers
The oxidation number of manganese (Mn) in potassium permanganate (KMnO4) is B. +7.
Potassium permanganate is a strong oxidizing agent that is commonly used in organic chemistry to oxidize alcohols, aldehydes, and ketones to carboxylic acids. Its formula is KMnO4.The oxidation state of manganese in KMnO4 is determined by subtracting the sum of the oxidation states of potassium, oxygen, and hydrogen from the overall charge of the molecule. The oxidation state of potassium is +1, and the oxidation state of oxygen is -2. Hydrogen's oxidation state is +1, and it is usually removed from the organic compound in question, so it is not included in the final calculation. For KMnO4, the overall charge is -1. Using this information,
we can calculate the oxidation state of manganese as follows: Oxidation state of Mn + Oxidation state of K + 4(Oxidation state of O) = -1Oxidation state of Mn + 1 + 4(-2) = -1Oxidation state of Mn - 7 = -1 Oxidation state of Mn = +7Therefore, the oxidation state of manganese in potassium permanganate is +7. Therefore the correct option is B
The complete question is :
What is the oxidation number of manganese (MN) in potassium permanganate (KMnO4)?
A. +5,
B. +7,
C. +8,
D. +9
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what concentration of the lead ion, pb2 , must be exceeded to precipitate pbcl2 from a solution that is 1.00×10−2 m in the chloride ion, cl− ? ksp for lead(ii) chloride is 1.17×10−5 .
Answers
We can use the solubility product constant (Ksp) for lead(II) chloride, which is 1.17 x 10-5 to determine the concentration of the lead ion (Pb2+) that must be exceeded to precipitate PbCl2 from a 1.00 x 10-2 M solution of chloride ions (Cl-).
The equilibrium constant for a solid material dissolving in an aqueous solution is denoted by the solubility product constant, which is abbreviated as Ksp. It is a measurement that indicates how much of a solute may be dissolved in a solution. The Ksp value of a material is greater when it has a higher degree of solubility.
The dissociation reaction for PbCl2 in water is:
PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)
The Ksp expression for this reaction is:
Ksp = [Pb2+][Cl-]^2
We are given the concentration of Cl- as 1.00 x 10^-2 M. Let [Pb2+] = x, so we can plug in the values into the Ksp expression:
1.17 x 10^-5 = x(1.00 x 10^-2)^2
Now, solve for x:
x = (1.17 x 10^-5) / (1.00 x 10^-2)^2
x ≈ 1.17 x 10^-1
Therefore, the concentration of lead ion (Pb2+) that must be exceeded to precipitate PbCl2 from the solution is approximately 1.17 x 10^-1 M.
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at the same temperature, do he gas molecules and xe gas molecules have the same average kinetic energy?
Answers
Yes, He gas molecules and Xe gas molecules have the same average kinetic energy at the same temperature. This is known as the principle of equipartition of energy.
The kinetic energy of gas molecules is proportional to the absolute temperature, as per the kinetic theory of gases, which states that gases are made up of a large number of small particles that are in constant, random motion.
Gas molecules collide with each other and with the walls of the container in which they are placed as a result of this movement. The average kinetic energy of a gas molecule is proportional to the absolute temperature, which is the sum of the kinetic energies of all the gas molecules divided by the total number of molecules in the gas.
The kinetic energy of a molecule can be measured using the following equation:
KE = (1/2)mv²
Where,
Kinetic energy (KE)
m = Mass of the molecule
v = Velocity of the molecule.
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for your percent yield calculations you should hae presumed the limiting reagent was styrene. the presumption might not be accurate! what could have occurred that would result in a reagent other than syrene being the limiting reaget?
Answers
A limiting reagent refers to the reagent present in a reaction that will limit the quantity of product generated. The yield of a reaction is calculated by calculating the percent yield. The percent yield is a percentage representation of the number of products generated by a reaction compared to the amount of product that should be generated based on stoichiometry or the total number of products that should be generated in the absence of loss or side reactions.
In cases where a reagent other than styrene is the limiting reagent, the presumptions made for the calculations become invalid, and hence the calculated results become inaccurate or unreliable. The reason why a reagent other than styrene could become the limiting reagent is as follows:
The reagents or reactants might have been impure, resulting in reduced reaction rates or reduced reaction yields.The reagents or reactants might have been of the incorrect proportions, resulting in reduced reaction rates or reduced reaction yields.The temperature or pressure of the reaction might have been too low or too high, resulting in reduced reaction rates or reduced reaction yields.The reaction was influenced by side reactions that resulted in the formation of different reaction products.To learn more about "percent yield", visit: https://brainly.com/question/30944610
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which characteristic belongs to metal elements
Answers
c. Easily Gain Electrons. Easily Gain Electrons belongs to metal elements.
Metal elements are characterized by having relatively low ionization energies and high electronegativities. This allows them to easily gain electrons from other elements in chemical reactions.Metals are chemical elements that are characterized by their ability to conduct electricity, have a metallic luster, and are malleable and ductile. They are divided into two main categories: ferrous metals, which contain iron, and non-ferrous metals, which do not.An atom can easily gain electrons by participating in a redox reaction. This is when electrons are transferred between two atoms, and the atom that receives the electrons gains them.
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a certain carbohydrate produced an observed rotation of 2.70 degrees at a concentration of 0.022 g/ml in a 1 dm cell. what is its specific rotation? (do not include any units.)
Answers
The specific rotation of the carbohydrate is 12.27 when observed rotation is 2.70 degrees at a concentration of 0.022 g/ml in a 1 dm cell
The specific rotation, denoted by [α], is a measure of the ability of a compound to rotate plane-polarized light and is defined as the observed rotation in degrees divided by the concentration in grams per milliliter and the path length in decimeters.
Mathematically, we can express it as:
[α] = observed rotation / (concentration x path length)
In this problem, we are given:
observed rotation = 2.70 degrees
concentration = 0.022 g/mL
path length = 1 dm = 10 cm
Substituting these values into the formula, we get:
[α] = 2.70 degrees / (0.022 g/mL x 10 cm)
[α] = 2.70 degrees / 0.220 g/cm³
[α] = 12.27
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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation how many moles of water can be made when 158.2 grams of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element
Molar Mass
Hydrogen
1
Nitrogen
14
Copper
63.5
Oxygen
16
Answers
Rounded to the nearest tenth, answer is 0.5 moles of water.
What is meant by molar masses?Mass of a chemical compound divided by its amount of the substance measured in moles is molar mass.
Molar mass of HNO3 = 1(1.008) + 1(14.01) + 3(16.00) = 63.01 g/mol
Number of moles of HNO3 = 158.2 g / 63.01 g/mol = 2.51 mol
From the balanced equation, we see that 4 moles of water are produced for every 3 moles of Cu consumed. Therefore, number of moles of water produced is as:
2.51 mol HNO3 × (4 mol H2O / 8 mol HNO3) × (3 mol Cu / 8 mol HNO3) = 0.4719 mol H2O
Rounded to the nearest tenth, answer is 0.5 moles of water.
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the ph of a 1.00 m solution of caffeine, a weak organic base, is 12.300. calculate the ka of protonated caffeine.
Answers
Ka of protonated caffeine is approximately 5.0 × 10^-13.
Step-by-step explanation:
To calculate the Ka of protonated caffeine (HCaffeine), we can use the following equation:
Kb * Ka = Kw
where Kb is the base dissociation constant of caffeine, Ka is the acid dissociation constant of HCaffeine, and Kw is the ion product constant of water (1.0 × 10^-14 at 25°C).
Since caffeine is a weak organic base, we can assume that it reacts with water to form the conjugate acid, HCaffeine, and hydroxide ions:
Caffeine + H2O ⇌ HCaffeine + OH^-
The equilibrium constant for this reaction is the base dissociation constant of caffeine (Kb).
Kb * Ka = Kw
Rearranging the equation to solve for Ka, we get:
Ka = Kw / Kb
The pH of the 1.00 M caffeine solution is 12.300, so the pOH is:
pOH = 14.000 - pH = 14.000 - 12.300 = 1.700
From this, we can calculate the hydroxide ion concentration:
[OH^-] = 10^(-pOH) = 10^(-1.700) = 0.020 M
Since caffeine is a weak base, we can assume that [OH^-] is primarily due to the dissociation of HCaffeine:
HCaffeine ⇌ H+ + Caffeine
From this, we can calculate the concentration of HCaffeine:
[HCaffeine] = [OH^-] = 0.020 M
And we know that the initial concentration of caffeine is 1.00 M. Since the dissociation of HCaffeine is assumed to be small, we can assume that the concentration of caffeine remaining is also 1.00 M.
Therefore, the concentration of H+ ions can be calculated using the equation for the ion product constant of water:
Kw = [H+][OH^-]
1.0 × 10^-14 = [H+][0.020]
[H+] = 5.0 × 10^-13 M
Now we can calculate the Ka of protonated caffeine:
Ka = Kw / Kb = (1.0 × 10^-14) / (0.020) = 5.0 × 10^-13
Therefore, the Ka of protonated caffeine is approximately 5.0 × 10^-13.
list and describe the three subatomic particles that make up atoms.
Answers
Atoms are made up of three subatomic particles: protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus of an atom.
They have a mass of approximately 1 atomic mass unit (AMU). Neutrons, also found in the nucleus, have no charge and have a mass of approximately 1 amu. Electrons are negatively charged particles that orbit around the nucleus in shells or energy levels. They have a much smaller mass than protons and neutrons and are responsible for chemical reactions and bonding between atoms. Understanding the properties and behaviors of these subatomic particles is crucial in understanding the nature of matter and the physical world around us.
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a 25.00 ml volume of hcl is titrated to endpoint with 27.46 ml of 0.1138 m naoh. what the the initial concentration of hcl?
Answers
The initial concentration of the HCl solution was 0.1251 M.
The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:
HCl + NaOH → NaCl + H2O
We can use the balanced equation and the volume and concentration of the NaOH solution to calculate the number of moles of NaOH used in the titration:
moles of NaOH = volume of NaOH x concentration of NaOH
moles of NaOH = 0.02746 L x 0.1138 mol/L
moles of NaOH = 0.003127 mols
Since HCl and NaOH react in a 1:1 ratio, the number of moles of HCl used in the titration is also 0.003127 moles.
Now, we can use the number of moles of HCl and the volume of HCl to calculate the initial concentration of HCl:
moles of HCl = concentration of HCl x volume of HCl
0.003127 mol = concentration of HCl x 0.02500 L
concentration of HCl = 0.1251 M
Therefore, the initial concentration of the HCl solution was 0.1251 M.
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Down
15. a liquid can ____ from one place to another
18.a Bunsen burner adds heat _____ to something
Across
14. characteristics of a substance
16. it ______ was 250ml
Answers
Answer:
15. Flow
16. Volume
Explanation:
That must be the right answer
how does understanding of matter help humans move from stone age to the iron age?
Answers
Understanding matter and its properties helped humans move from the stone age to the iron age by enabling them to develop new materials and technologies. In the stone age, humans used materials such as stone, bone, and wood to create tools and weapons. However, these materials had limitations in terms of their strength, durability, and ability to hold a sharp edge.
As humans began to understand the properties of matter, they were able to experiment with new materials and processes. For example, they learned that by heating certain rocks, they could extract metals such as copper and tin, which could be used to create stronger tools and weapons. By combining copper with tin, they discovered that they could create bronze, which was even stronger and more durable.
Eventually, humans discovered how to extract iron from iron ore and use it to create even stronger tools and weapons. This knowledge of matter and metallurgy enabled humans to advance technologically and culturally, leading to the development of civilizations and the rise of empires.
In summary, understanding the properties of matter helped humans move from the stone age to the iron age by enabling them to experiment with new materials and develop new technologies. This process of discovery and innovation continues to this day, as scientists and engineers continue to push the boundaries of our knowledge and understanding of the natural world.
Why does California has areas that are colder than Nevada even though they are similar in latitude?
O Warm ocean currents travel across California.
O Cold ocean currents travel across California.
O Cold ocean currents travel across Nevada.
Warm ocean currents travel across Nevada
O
A
1
2 3
4.
5 6
Answers
Answer:
Explanation:
The main reason why California has areas that are colder than Nevada, despite being at similar latitudes, is due to the influence of ocean currents. Specifically, California is impacted by a cold ocean current known as the California Current, which flows southward along the western coast of North America, while Nevada is an inland state without access to any major ocean currents.
The California Current brings cool water from the Gulf of Alaska down the coast, resulting in lower temperatures along the California coast, particularly in the northern regions. In contrast, Nevada has a desert climate with high temperatures and low humidity, due to its inland location and lack of major bodies of water.
So, the correct option would be "Cold ocean currents travel across California." (Option 2).
(ID) Evidence:- The law of conservation of mass says that - The number of atoms before - - The sum of reactants (III) Reasoning; Maria is I know this because the sum of products. The chemical substances created have the correct; incorrect nor destroyed in a chemical reaction. The The mass in the chemical reaction Word bank-Use the words in the word bank to fill in the empty spaces. (1) Claim Evidence after a chemical reaction a chemical reaction equals the because the reactants products. The new Atoms are not created; sum of products; mass will stay the same; number of atoms after; Reasoning sum of reactants; same mass as the reactants; stays the same; number of atoms is not changing, reaction abo is balanced
Answers
Claim: According to the rule of conservation of mass, a chemical reaction's mass remains constant since the number of atoms present before and after the reaction is equal.
Evidence: Maria is correct because the chemical reaction's total reactants and total products are equal. The mass of the resulting chemicals is equal to that of the reactants.
The law of conservation of mass stipulates that atoms are neither formed, destroyed, or altered during a chemical reaction, which is why this is the case.
Word bank: number of atoms following a chemical reaction, the sum of products, not generated, amount of reactants, unchanged, reactants have the same mass, Reasoning, the mass will remain the same, assertion, and proof
The claim is made in reference to the law of conservation of mass, which stipulates that the total mass of the reactants and the total mass of the products created in a chemical reaction are equal.
This law suggests that throughout a chemical reaction, atoms are neither generated nor destroyed.
The fact that the number of atoms before and after a chemical reaction is equal is used as evidence to back up this assertion.
This is so because the total of the reactants, or the substances that first participate in the reaction, must match the total of the products. (the substances formed as a result of the reaction).
Therefore, in order for the rule of conservation of energy to apply, the masses of the reactants and products must be equal.
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zeolites theoretically can be made magnetic by adding sodium ion to them.T/F
Answers
The given statement is true. Zeolites hypothetically can be made attractive by adding sodium particles to them. Zeolites are utilized as sponges just and have no different purposes.
A compelling method for testing how much red color is in a watery arrangement is to gauge how much red light (620-750 nm) is consumed by the arrangement.
The expression "zeolite" was first utilized in the year 1756 by Axel Fredrik Cronstedt, a Swedish mineralogist. During a course of quickly warming a material that was seen to be stilbite, it delivered a lot of steam. This was because of the water that the material had retained before. Subsequent to seeing such turns of events, he authored the term zeolite. It has been gotten from the Greek words, ζέω (zéō), signifying "to bubble" and λίθος (líthos), signifying "stone".
Engineered zeolites are normally blended by a course of slow crystallization of a silica-alumina gel within the sight of salts and natural layouts. Curiously, various designs could be made utilizing this interaction. Aside from varieties in structures, zeolites can be fabricated or produced using different iotas making them synthetically fascinating and dynamic. For example, purported heteroatoms incorporate germanium, iron, gallium, boron, zinc, tin, and titanium.
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3.
(b) Sulfuryl fluoride is a tetrahedral molecule where the sulfur atom has no lone pairs of
electrons.
0=
F
F
Use the valence shell electron pair repulsion theory (VSEPR) to state why sulfuryl fluoride
has this shape.
[1]
Answers
According to the VSEPR theory, the shape of a molecule is determined by the repulsion between its electron pairs, both bonding and non-bonding.
What is VSPER theory in sulfuryl fluoride?In sulfuryl fluoride (SO2F2), the sulfur atom is surrounded by four regions of electron density: two single bonds with fluorine atoms and two double bonds with oxygen atoms. These four regions of electron density repel each other and arrange themselves as far apart as possible to minimize repulsion.
What is lone pair?Since the molecule has no lone pairs of electrons, the electron density is evenly distributed among the four regions around sulfur. This results in a tetrahedral shape, where the fluorine atoms and oxygen atoms are arranged symmetrically around the central sulfur atom, with bond angles of approximately 109.5 degrees.
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Categorize the following exercises as being isometric or isotonic.1. Pushing constantly against a concrete wall2. Running up a hill3. Swimming freestyle4. Pedaling a bicycle on a flat surface5. Holding a bench-press bar in the same position6. Doing a plank exercise (holding a push-up position)7. Balancing on tiptoes8. Doing bicep curls
Answers
The following are categorized into isometric and isotonic:
Isometric: Pushing constantly against a concrete wall, Holding a bench-press bar in the same position, Doing a plank exercise (holding a push-up position), and Balancing on tiptoes.
Isotonic: Running up a hill, Swimming freestyle, Pedaling a bicycle on a flat surface, and Doing bicep curls.
Isometric exercises are exercises where a muscle or group of muscles contracts without any change in length. These exercises involve the muscle or group of muscles contracting against an immovable object or against an opposing force. Examples of isometric exercises are pushing against a wall, holding a plank, and doing a wall sit.
Isotonic exercises are exercises that involve the muscle or group of muscles contracting against resistance, and causing a change in the muscle’s length. These exercises involve the muscle or group of muscles contracting and then extending against a fixed weight or external force.
Examples of isotonic exercises are running up a hill, swimming freestyle, pedaling a bicycle on a flat surface, doing bicep curls, and doing leg extensions.
1. Pushing constantly against a concrete wall - Isometric Exercise
2. Running up a hill - Isotonic Exercise
3. Swimming freestyle - Isotonic Exercise
4. Pedaling a bicycle on a flat surface - Isotonic Exercise
5. Holding a bench-press bar in the same position - Isometric Exercise
6. Doing a plank exercise (holding a push-up position) - Isometric Exercise
7. Balancing on tiptoes - Isometric Exercise
8. Doing bicep curls - Isotonic Exercise
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Which best describes the pH at the equivalence point of a titration of a weak base with a strong acid?
A. less than zero
B. between 0 and 7
C. close to 7.0
D. between 7 and 14
E. greater than 14
Answers
the correct option is D. between 7 and 14 best describes the pH at the equivalence point of a titration of a weak base with a strong acid.
The pH at the equivalence point of a titration of a weak base with a strong acid is somewhere in the range of 7 and 14. At the equivalence point, the quantity of moles of the base is equivalent to the number of moles of acid added. The pH at the equivalence point depends on the strength of the weak base. On the off chance that the weak base is exceptionally weak, the pH at the equivalence point will be closer to 7.0. If the weak base is stronger, the pH at the equivalence point will be closer to 14.0.
A weak base is a substance that, when dissolved in water, does not break totally into its constituent ions. Weak bases have some other properties, such as their solutions being unfortunate conductors of power. They are also categorized as weak electrolytes. Examples of weak bases incorporate smelling salts (NH3), pyridine (C5H5N), and trimethylamine (N(CH3)3).
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At what temperature does (5.9000x10^1) g of ammonia gas exert a pressure of (1.70x10^2) kPa in a (9.300x10^1) L container?
Answers
To solve this problem, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:
PV = nRT
where P is the pressure in Pa, V is the volume in m³, n is the number of moles, R is the ideal gas constant (8.31 J/(molₓK)), and T is the temperature in Kelvin.
First, we need to convert the pressure from kPa to Pa and the volume from L to m³:
P = 1.70x10² kPa x 1000 Pa/kPa = 1.70x10⁵ Pa
V = 9.300x10¹ L x 0.001 m³/L = 0.093 m³
Next, we need to calculate the number of moles of ammonia using its molar mass:
molar mass of ammonia (NH3) = 14.01 g/mol + 3(1.01 g/mol) = 17.03 g/mol
moles of NH3 = 5.9000x10¹ g ÷ 17.03 g/mol = 3.462 mol
Now we can rearrange the ideal gas law to solve for the temperature:
T = PV ÷ nR
T = (1.70x10⁵ Pa)(0.093 m³) ÷ (3.462 mol)(8.31 J/(molₓK))
T = 686.3 K
Therefore, at a temperature of 686.3 K (413.1 °C or 775.6 °F), 5.9000x10¹ g of ammonia gas would exert a pressure of 1.70x10² kPa in a 9.300x10¹ L container.
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describe the motion and arrangement of atoms during the solid phase (ice). the volume or amount of space taken up is [definite/indefinite]. the shape of ice is [definite/indefinite].
Answers
In the solid phase, the atoms of a substance are closely packed together and held in a fixed position by intermolecular forces. In the case of ice, which is a solid form of water, the atoms are arranged in a regular pattern, forming a crystal lattice structure.
The motion of atoms in the solid phase is limited to small vibrations around their fixed positions. These vibrations are caused by thermal energy, but they are not significant enough to overcome the intermolecular forces that hold the atoms in place. As a result, the shape of the solid, including ice, is definite and maintains a fixed shape.
The volume or amount of space taken up by a solid, including ice, is also definite. The intermolecular forces between the atoms prevent them from moving around freely, and as a result, the solid has a fixed volume.
Overall, in the solid phase, such as ice, the arrangement of atoms is regular and fixed, and their motion is limited to small vibrations around their fixed positions. The volume or amount of space taken up is definite, and the shape is also definite and maintains a fixed shape.
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Which of these ions has the smallest number of unpaired electrons?
V2+
Cr2+
Ni2+
Co2+
Fe3+
Answers
The ion with the smallest number of unpaired electrons is Ni2+.
Determination of number of unpaired electronsThe number of unpaired electrons in an ion depends on its electronic configuration, specifically the number of electrons in its partially filled d-orbitals.
Out of the given ions, V2+ and Cr2+ have the electronic configurations [Ar] 3d3 and [Ar] 3d4 respectively, and both have three unpaired electrons.
Ni2+ has the electronic configuration [Ar] 3d8, and it has two unpaired electrons.
Co2+ has the electronic configuration [Ar] 3d7, and it has three unpaired electrons.
Fe3+ has the electronic configuration [Ar] 3d5, and it has five unpaired electrons.
Therefore, Ni2+ has the smallest number of unpaired electrons among the given ions with two unpaired electrons.
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How many atoms are in 6 KCIO3?
Answers
There are 3.6312 x 10²⁴ atoms in 6 moles of KCIO3 because there are 6 moles of KCIO3 and 6.022 x 10²³ atoms per mole.
What fraction of a molecule is KClO3?Potassium One atom of potassium, three atoms of oxygen, and one atom of chlorine make up the inorganic substance chlorate.
The molar mass of KCIO3 is:
K = 39.10 g/mol
Cl = 35.45 g/mol
I = 126.90 g/mol
O3 = (16.00 x 3) g/mol = 48.00 g/mol
Molar mass of KCIO3 = K + Cl + I + 3O3
= 39.10 + 35.45 + 126.90 + 3(48.00)
= 307.35 g/mol
6 KCIO3 = 6 moles KCIO3
Number of atoms = 6 moles [tex]KCIO3 x 6.022 x 10^23[/tex] atoms/mol
[tex]= 3.6312 x 10^24 atoms[/tex]
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a gaseous mixture contains 1.50 mol of o2, 2.50 mol of he and 0.500 mol of n2. the partial pressue of the oxygen is 0.300atm. what are the partial pressures of the nitrogen and the helium
Answers
The partial pressure of nitrogen is 0.116 atm and the partial pressure of helium is 0.583 atm.
To find the partial pressures of nitrogen and helium, we can use the fact that the total pressure of the mixture is equal to the sum of the partial pressures of each component:
P_total = P_O2 + P_He + P_N2
We are given the partial pressure of oxygen as P_O2 = 0.300 atm. We can find the total number of moles of gas in the mixture as:
n_total = n_O2 + n_He + n_N2 = 1.50 mol + 2.50 mol + 0.500 mol = 4.50 mol
We can use the mole fraction of each component to find the partial pressure of nitrogen and helium.
X_N2 = n_N2 / n_total = 0.500 mol / 4.50 mol = 0.111
X_He = n_He / n_total = 2.50 mol / 4.50 mol = 0.556
The mole fraction of oxygen is then:
X_O2 = n_O2 / n_total = 1.50 mol / 4.50 mol = 0.333
We can use these mole fractions to find the partial pressures of nitrogen and helium:
P_N2 = X_N2 * P_total = 0.111 * P_total
P_He = X_He * P_total = 0.556 * P_total
Substituting the given value for P_O2 and adding the expressions for P_N2 and P_He, we get:
P_total = P_O2 + P_N2 + P_He
P_N2 + P_He = P_total - P_O2 = (1.000 atm - 0.300 atm) = 0.700 atm
Substituting the expressions for P_N2 and P_He in terms of mole fractions, we get:
0.111 * P_total + 0.556 * P_total = 0.700 atm
0.667 * P_total = 0.700 atm
P_total = 1.049 atm
Now we can use the expressions for P_N2 and P_He in terms of mole fractions to find their partial pressures:
P_N2 = 0.111 * P_total = 0.116 atm
P_He = 0.556 * P_total = 0.583 atm]
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WILL MARK BRAINLIEST PLS HELP! Predict whether or not the following single replacement reaction will happen. If the reaction will occur, write a complete balanced equation.
Calcium + Lead (II) nitrate →
Answers
Answer:
A Single replacement/displacement reaction will occur, making the equation:
Calcium + Lead (II) nitrate → Calcium Nitrate + Lead (II)
Ca + Pb(NO3)2 → Ca(NO3)2 + Pb
Explanation:
Calcium is more reactive than Lead in the reactivity series so theoretically will replace in Lead in Lead Nitrate, forming Calcium Nitrate.
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In which solution is AgCl most soluble?
A. in a solution that is 0.20 M in CaCl2
B. in a solution that is 0.20 M in AgNO3
C. in a solution that is 0.20 M in KNO3
Answers
AgCl (silver chloride) is most soluble in a solution that is 0.20 M in AgNO₃. Option B is correct.
Solubility is the property of a substance to dissolve in a solvent to form a homogeneous solution. It is typically measured as the maximum amount of a solute that can dissolve in a given amount of solvent at a specific temperature and pressure. The solubility of a substance depends on various factors, such as temperature, pressure, solvent, and the presence of other solutes in the solution.
AgCl is sparingly soluble in water, but its solubility can be increased by the presence of common ions such as Ag⁺ from AgNO₃. The addition of Ca₂⁺ or K⁺ ions from CaCl₂ or KNO₃ will not have a significant effect on the solubility of AgCl.
Hence, B. in a solution that is 0.20 M in AgNO₃ is the correct option.
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CCl4 to Cl2
find the molar ratio
Answers
Answer:
we have a certain amount of Cl2 and want to calculate how much CCl4 we need, we would use the ratio of 1 mole of CCl4 for every 2 moles of Cl2.
Explanation:
The balanced chemical equation for the reaction of CCl4 to Cl2 is:
CCl4 → 2Cl2
From the equation, we can see that for every one molecule of CCl4, two molecules of Cl2 are produced.
This means that the molar ratio of CCl4 to Cl2 is 1:2.
In other words, if we start with one mole of CCl4, we would expect to produce two moles of Cl2. Conversely, if we have a certain amount of Cl2 and want to calculate how much CCl4 we need, we would use the ratio of 1 mole of CCl4 for every 2 moles of Cl2
the half-life of 218po is 3.1 minutes. how much of a 155 gram sample remains after 0.40 hours? the half-life of 218po is 3.1 minutes. how much of a 155 gram sample remains after 0.40 hours? 0.0047 g 0.00067 g 0.72 g 0.0072 g none of the above g
Answers
= 0.0072 g.
Step-by-step explanation:
Since the half-life of 218Po is 3.1 minutes, we can use the following formula to calculate the amount of 218Po remaining after a certain amount of time:
N = N0 * (1/2)^(t/t1/2)
where:
N0 = initial amount of 218Po
N = amount of 218Po remaining after time t
t = time elapsed
t1/2 = half-life of 218Po
First, we need to convert 0.40 hours to minutes:
0.40 hours x 60 minutes/hour = 24 minutes
Now we can plug in the values we know:
N = 155 g * (1/2)^(24/3.1)
N ≈ 0.0072 g
Therefore, approximately 0.0072 g of the 155 g sample of 218Po remains after 0.40 hours.
So the answer is 0.0072 g.
how many chirality centers are there in an aldohexose?
Answers
Aldohexoses have four chiral focuses and, in this way, 24 = 16 isomers. There will be eight d-isomers and eight l-isomers. Thusly, the quantity of enantiomer matches is 8 (2n−1).
An aldohexose has four chiral focuses.
So there are
24=16
optical isomers.
Their perfect representations are the L-aldohexoses, the other 8 of the 16.
Their names are L-allose, L-altrose, L-glucose, and so on.
Consequently, every one of the 16 aldohexoses has its own name.
The four chiral focuses in glucose show there might be upwards of sixteen (24) stereoisomers having this constitution. These would exist as eight diastereomeric sets of enantiomers, and the underlying test was to figure out which of the eight related to glucose. This challenge was acknowledged and met in 1891 by German physicist Emil Fischer. His fruitful exchange of the stereochemical labyrinth introduced by the aldohexoses was a sensible masterpiece, and it is fitting that he got the 1902 Nobel Prize for science for this achievement. At the time Fischer embraced the glucose project laying out the outright setup of an enantiomer was unrealistic. Thusly, Fischer pursued an erratic decision for (D)- glucose and laid out an organization of related aldose setups that he called the D-family. The identical representations of these arrangements were then assigned the L-group of aldoses. To represent utilizing present-day information, Fischer projection formulas and names for the D-aldose family (three to six-carbon atoms) are displayed underneath, with the uneven carbon atoms (chiral focuses) hued red.
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a student was titrating a solution of hc4h7o2 with a sr(oh)2 solution. determine the ph at a particular point in the titration. do this by constructing a bca table, constructing an ice table
Answers
The concentration of strontium hydroxide [tex]Sr(OH)2[/tex] is zero at this point in the titration, so it does not contribute to the pH calculation.
To determine the pH of the solution at a particular point in the titration [tex]HC4H7O2[/tex], we need to construct a BCA (before, change, after) table and an ICE (initial, change, equilibrium) table.
The balanced chemical equation for the reaction is
[tex]2 HC4H7O2 + Sr(OH)2 → Sr(C4H7O2)2 + 2 H2O[/tex]
[tex]BCA Table:Reactant | HC4H7O2 | Sr(OH)2Initial | x | yChange | -2x | -yAfter | x-2x | y-y[/tex]
In the BCA table, we assume that x moles of Butyric acid [tex]HC4H7O2[/tex] and y moles of [tex]Sr(OH)2[/tex] are present in the reaction mixture. Since the stoichiometric coefficient [tex]HC4H7O2[/tex] is 2 in the balanced equation, the change in its concentration is -2x moles, while for strontium hydroxide [tex]Sr(OH)2[/tex], it is -y moles. The final concentration of Butyric acid [tex]HC4H7O2[/tex] is (x-2x) moles and that of strontium hydroxide [tex]Sr(OH)2[/tex] is (y-y) moles.
From the ICE table, we can see that the initial concentration of Butyric acid [tex]HC4H7O2[/tex] is x moles and the concentration of[tex]H3O+[/tex] produced is 2x moles. Therefore, the pH at this point in the titration can be calculated as follows:
[tex]pH = -log[H3O+][H3O+] = 2x / V[/tex]
where V is the volume of the solution.
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