1 mole of H₂SO₄ reacts with 1 mole of Na₂CO₃, the amount of H₂SO₄ used in the titration is also 0.00125 moles.
What is Mole?
In chemistry, a mole is a unit used to measure the amount of a substance. One mole of a substance contains Avogadro's number of particles, which is approximately 6.02 x [tex]10^{23}[/tex] particles. The mass of one mole of a substance is equal to its atomic or molecular weight in grams.
The balanced chemical equation for the reaction between H₂SO₄ and Na₂CO₃ is:
H₂SO₄ + Na₂CO₃ → Na₂SO₄ + H₂O + CO₂
a) The amount of H₂SO₄ used can be calculated from the burette readings. Assuming the average volume of the acid used is 23.5 cm³, and the concentration of the acid is unknown, we can calculate the number of moles of H₂SO₄ used in the titration as follows:
Moles of H₂SO₄ = Volume of H₂SO₄ (in dm³) x Concentration of H₂SO₄
We don't know the concentration of H₂SO₄, so we can't calculate the amount of H₂SO₄ directly from the titration. We need to use the stoichiometry of the balanced equation to relate the amount of H₂SO₄ to the amount of Na₂CO₃ in solution B.
From the balanced equation, we can see that 1 mole of H₂SO₄ reacts with 1 mole of Na₂CO₃. Therefore, the amount of Na₂CO₃ in solution B can be calculated as follows:
Amount of Na₂CO₃ = 0.050 mol/dm³ x 0.025 dm³ = 0.00125 moles
Since 1 mole of H₂SO₄ reacts with 1 mole of Na₂CO₃, the amount of H₂SO₄ used in the titration is also 0.00125 moles.
b) To calculate the concentration of H₂SO₄ in solution A, we can rearrange the equation above:
Concentration of H₂SO₄ = Moles of H₂SO₄ / Volume of H₂SO₄
Substituting the values we have:
Concentration of H₂SO₄ = 0.00125 moles / 0.0235 dm³ = 0.053 mol/dm³
c) From the balanced equation, we can see that 1 mole of H₂SO₄ produces 2 moles of H⁺ ions. Therefore, the number of hydrogen ions in 1 dm³ of solution A is:
Number of H⁺ ions = 2 x Concentration of H₂SO₄
Substituting the concentration of H₂SO₄ we calculated above:
Number of H⁺ ions = 2 x 0.053 mol/dm³ = 0.106 mol/dm³
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A solid chloride sample weighing 0.3147 g required 43.75 mL of 0.05273 M AgNO, to reach the Ag,CrO, end point.
a. How many moles Cl ion were present in the sample? (Use Eqs. 2 and 3.)
b. How many grams Cl- ion were present? (Use Eq. 4.)
c. What was the mass percent C ion in the sample? (Use Eq. 5.) moles Cr g Cr % Cr
Answer:its a
Explanation: i juts know it is hope it helps
C2H6O + 3 O2 → 2 CO2 + 3 H2O
How many moles of CO2 is produced with 8.5 g of O2
0.32 mol
5.7 mol
0.53 mol
0.18 mol
The number of moles of CO₂ produced from the reaction of 8.5 g of oxygen gas, O₂ is 0.18 mole (last option)
How do i determine the number of mole of CO₂ produced?We shall begin by obtaining the mole in 8.5 g of oxygen gas, O₂. Details below:
Mass of oxygen gas, O₂ = 8.5 grams Molar mass of oxygen gas, O₂ = 32 g/mol Mole of oxygen gas, O₂ =?Mole = mass / molar mass
Mole of oxygen gas, O₂ = 8.5 / 32
Mole of oxygen gas, O₂ = 0.266 mole
Finally, we shall determine the number of mole of CO₂ produced. Details below:
C₂H₆O + 3O₂ -> 2CO₂ + 3H₂O
From the balanced equation above,
3 moles of O₂ reacted to produce 2 moles of CO₂
Therefore,
0.266 mole of O₂ will react to produce = (0.266 × 2) / 3 = 0.18 mole of CO₂
Thus, the number of mole of CO₂ produced is 0.18 mole (last option)
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The CF4 molecule has a central C atom bonded to four F atoms, as shown in the figure. Which of the following statements about the CF4 molecule is or are true?
I. The electrons in the C-F bonds are attracted to both the C and F nuclei.
II. The Lewis structure of CF4 shows four bonding pairs of electrons and no nonbonding pairs.
III. Every atom in the CF4 molecule satisfies the octet rule.
A: I and III are true.
B: II and III are true.
C: Only one of the statements is true.
D: All three statements are true.
E: I and II are true.
The correct answer is B. The Lewis structure of CF4 indicates four bonding pairs of electrons and no nonbonding pairs. and Every atom in the CF4 molecule satisfies the octet rule.
Lewis structures are used to determine the molecular geometry and bonding patterns in molecules. It is named after Gilbert N. Lewis, who introduced the concept of the chemical bond and valence electrons. In a Lewis structure, each atom is represented by its chemical symbol, and its valence electrons are shown as dots or lines around the symbol. The dots represent electrons that are not involved in chemical bonding, while the lines represent covalent bonds between atoms.
Covalent bonds are formed by the sharing of electrons between atoms, and the number of electrons shared between atoms determines the strength of the bond. They also help in predicting the polarity and reactivity of molecules. For example, a molecule with a polar covalent bond will have a dipole moment and will be more reactive in chemical reactions. Overall, the Lewis structure is a fundamental tool in chemistry that allows us to understand the behavior of molecules and their interactions with other molecules.
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How many grams are there in 5.47 x 1021 molecules of SO2?
O.33 grams of SO2
O.58 grams of SO2
O.72 grams of SO₂
O.49 grams of SO₂
Answer:
The correct answer is option (B) 0.58 grams of SO2.
Several weather variables are used to measure weather conditions. Identify 3 weather variables and their instruments that you would use to observe and collect data to determine the relationship between air mass movements and changes in weather.
The following are three weather variables and the tools that can be used to observe and gather data on them to ascertain how air mass movements and weather changes are related:
Temperature is a crucial factor in comprehending weather conditions and is measured using a thermometer.The quantity of water vapor in the air is known as humidity, and it is measured with a hygrometer. An anemometer and a wind vane are used to measure the speed and direction of the wind, respectively. Temperature: For instance, a high temperature means the air is warm and light, and it will rise. Conversely, if the temperature is low, the air will sink since it is heavy and chilly.Air pressure: High-pressure regions are known for having calm, sunny skies, whereas low-pressure regions are known for having gloomy, stormy skies.Wind speed: The direction of the wind can be used to determine the nature and movement of an air mass. The air mass is traveling from the north to the south, for instance, if the wind is blowing from the north.Scientists can discover patterns and connections between changes in weather and changes in air mass movement by observing and recording data on these meteorological variables.
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At standard temperature and pressure, a given sample of water vapor occupies a volume of 2.80 L. What is the weight of the water?
Explanation:
The weight of water vapor can be determined by using the ideal gas law, which relates the pressure, volume, and temperature of a gas to the number of moles of gas present. We can then use the molar mass of water to calculate the weight of the water vapor.
At standard temperature and pressure (STP), the pressure is 1 atm and the temperature is 273.15 K. The ideal gas law is expressed as:
PV = nRT
where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles, R is the gas constant (0.08206 L·atm/mol·K), and T is the temperature in Kelvin.
Rearranging this equation to solve for n, we have:
n = PV/RT
Substituting the values we know, we get:
n = (1 atm)(2.80 L) / (0.08206 L·atm/mol·K)(273.15 K)
n = 0.1082 mol
The molar mass of water is 18.01528 g/mol, so the weight of the water vapor is:
weight = n x molar mass
weight = 0.1082 mol x 18.01528 g/mol
weight = 1.952 g
Therefore, the weight of the water vapor is 1.952 g.
30/3/2023
7 Num 224/321094
CHM 106
irse
Assignment
What Do you understand by the term
florescence the forth
Alatrone
of
Carbon
2 Bxplain it's uses. as Mano tubules, Nano Structures,
Nano Chemist
Fluorescence is a phenomenon where a substance absorbs light at a specific wavelength and then emits light at a longer wavelength. This process occurs when an electron in a molecule or atom absorbs energy, becomes excited, and then returns to its ground state by releasing the absorbed energy as light.
Carbon is a versatile element that forms various allotropes such as graphite, diamond, and fullerenes. In the context of nanotechnology, carbon is used to create nanostructures like carbon nanotubes, graphene, and other related materials.
Carbon nanotubes (CNTs) are cylindrical nanostructures made up of carbon atoms, and they have extraordinary mechanical, electrical, and thermal properties. These properties make CNTs useful in various applications such as electronics, energy storage, and composite materials.
Graphene, another carbon nanostructure, is a single layer of carbon atoms arranged in a hexagonal lattice. It exhibits remarkable electronic, thermal, and mechanical properties. Graphene has potential applications in fields like electronics, sensors, and energy storage.
A nanochemist is a scientist who specializes in studying the synthesis, characterization, and applications of nanomaterials, including carbon-based nanostructures.
In summary, fluorescence is a light emission process that can be observed in certain substances, while carbon nanostructures like carbon nanotubes and graphene are materials with unique properties that have promising applications in nanotechnology.
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K
Beaction
H₂SO4+Za=26804+H₂
of paper. Then complete the
for you.
Reactants
Reactants Products
Fes
Products
Answer:
jbfnuebufubdbybefydbybdruubedbusbubedbufyubrfybrfbyfrybburuefubfburbufbu
Explanation:
jbfwbyeybfybefbueujdhyevfbyrcybyebcybrcybybcrybeyfybrfybfrybrgyb
Without checking their boiling points, how would you expect Cl2’s boiling point to compare to Br2's? Explain.
Based on their molecular properties, I would expect that the boiling point of Cl2 would be lower than that of Br2.
How does the boiling points compare?The boiling point of a substance is largely determined by the strength of the intermolecular forces between its molecules. In particular, substances with stronger intermolecular forces tend to have higher boiling points.
Both Cl2 and Br2 are halogens and exist as diatomic molecules. However, Br2 has more electrons than Cl2, and as a result, it has more electrons available for intermolecular interactions.
This means that Br2 molecules can form stronger London dispersion forces with each other than Cl2 molecules can. London dispersion forces are the weakest intermolecular force, but they still contribute to the overall strength of intermolecular attractions.
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About how many elements are known to form bonds with atoms
Answer:
The number refers to the number of bonds each of the element makes: Hydrogen makes 1 bond, Oxygen makes 2 bonds, Nitrogen makes 3 bonds and Carbon makes 4 bonds. These four elements are widely used when it comes to drawing Lewis structures at introductory chemistry level.
Explanation:
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An object can be moving at a constant speed and still accelerating if it is changing 6.______
If an object is changing directions, it can be moving at a constant speed while yet accelerating.
This is due to the fact that acceleration is a vector number that takes into consideration the speed of an object both in magnitude and direction.
StepsAn object's acceleration vector also changes as it changes direction, which causes the object's velocity vector to change.
As a result, even though the item is moving at a constant speed, the change in its velocity vector is causing it to accelerate.
Centripetal acceleration is the term for the type of acceleration that keeps objects moving in a circular motion.
Even though an object's speed is constant while it moves in a circular pattern, it is still accelerating.
This is due to the fact that acceleration is a vector number that takes into consideration the speed of an object both in magnitude and direction.
As an item follows a circular course, its acceleration vector also constantly changes direction along with its velocity vector.
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Glutamic acid is an amino acid with pKa values of 2.19, 4.25 and 9.67, a-ketoglutarate is a bivalent organic acid. What is the approximate charge
difference between glutamic acid and a-ketoglutarate at pH 9.5?
a) 1 1/2
b) 2
c) 0
d) 1/2
e) 1
The approximate charge difference between glutamic acid and a-ketoglutarate at pH 9.5 would be 1. Option E.
Charge difference between 2 amino acidsAt pH 9.5, the protonation state of glutamic acid and a-ketoglutarate can be determined as follows:
Glutamic acid: At pH 9.5, the carboxyl group (-COOH) will be deprotonated, and the amino group (-NH2) will be protonated, giving the species -COO-CH2-CH(NH3+)-COO-.
The side chain carboxyl group (-COOH) can also be deprotonated to a small extent, giving the species -COO-CH2-CH(NH3+)-COO- and -COO-CH2-CH(NH2)-COO-. At this pH, the predominant species will be the first one, since the pKa of the carboxyl group is 2.19, which means that it will be mostly deprotonated at pH 9.5.
a-ketoglutarate: At pH 9.5, both carboxyl groups (-COOH) will be deprotonated, giving the species -COO-CH2-CO-CH2-COO-.
Therefore, the charge difference between glutamic acid and a-ketoglutarate at pH 9.5 can be calculated by subtracting the number of positive charges (protonated amino group) and negative charges (deprotonated carboxyl groups) in a-ketoglutarate from the corresponding charges in glutamic acid:
Glutamic acid: -1 (protonated amino group) - 2 (deprotonated carboxyl groups) = -3
a-ketoglutarate: 0 (no protonated amino group) - 2 (deprotonated carboxyl groups) = -2
Therefore, the charge difference is: -3 - (-2) = -1
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B) Dilution Problems. Calculate the concentration of a) each solute and b) each ion when the following are mixed.
50.0 mL of 0.750 M KOH and 25.0 mL of 0.500 M KOH
a. The final concentration of KOH is 0.500 M.
b. The concentration of K+ and OH- ions is 0.500 M.
Step by step explanationTo solve this problem, we need to use the equation:
M1V1 = M2V2
where M1 is the initial concentration of the solution, V1 is the initial volume of the solution, M2 is the final concentration of the solution, and V2 is the final volume of the solution.
a) To find the concentration of each solute, we need to first determine the final volume of the solution:
Final volume = 50.0 mL + 25.0 mL = 75.0 mL
Now we can use the equation above to find the final concentration of KOH:
M1V1 = M2V2
(0.750 M)(50.0 mL) = M2(75.0 mL)
M2 = (0.750 M)(50.0 mL) / (75.0 mL)
M2 = 0.500 M
Therefore, the final concentration of KOH is 0.500 M.
b) To find the concentration of each ion, we need to use the final concentration of KOH and the fact that KOH dissociates into K+ and OH- ions in solution. The concentration of K+ and OH- ions will be the same as the final concentration of KOH:
[ K+ ] = 0.500 M
[ OH- ] = 0.500 M
Therefore, the concentration of K+ and OH- ions is 0.500 M.
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The pOH of a solution is 8.3. Which of the following is true about the solution?
a
It is acidic and has a pH of 5.7.
b
It is acidic and has a pH of 3.8.
c
It is basic and has a pH of 5.7.
d
It is basic and has a pH of 3.8.
An answer has a pOH of 8.3. True about the solution is that it is basic and has a pH of 5.7.
What does "solution" mean in its simplest form?When one or more solutes are dissolved in a solvent, the result is a homogenous mixture known as a solution. a solvent is a substance that helps a solute dissolve so that a homogenous mixture results. When a substance dissolves in a solvent, it forms a homogenous mixture, which is known as a solute.
Why is a solution important in chemistry?A continuous variation in the relative proportions of a number of substances that is homogeneous and can be changed up to the solubility limit. Although the word "solution" is typically used to describe the liquids state of a substance, it is also possible for gases and solids to form solutions.
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The correct answer is that it is acidic and has a pH of 5.7.
Work out what the substances are and which one was used? I know what the first one is and I know what other chromatography one is used i just don't know how to identify it.
d (i) Rf of 0.54 could be substance B or substance D.
d (ii) It would eliminate any potential errors or uncertainties from the first experiment.
Describe Chromatography?Chromatography is a laboratory technique used for separating and analyzing mixtures of substances. It involves passing a mixture through a stationary phase, which is typically a solid or liquid, and a mobile phase, which is a gas or liquid. The different components of the mixture will interact differently with the stationary and mobile phases, causing them to move at different rates and ultimately separate from each other.
1 (d) (i) Based on the Rf values given in the table, two possible identities for the substance that caused the spot with an Rf of 0.54 could be substance B or substance D.
1 (d) (ii) To confirm which one of the substances (B or D) caused the spot, a chromatography experiment with a different solvent could be carried out. This would involve using a solvent that has a different polarity than water, such as hexane or chloroform, and running a new paper chromatography of the mixture. If the same spot appears at the same Rf value as in the previous experiment, then it is likely that the substance causing the spot is substance B. However, if a different spot appears at a different Rf value, then the substance causing the original spot is likely to be substance D. This experiment would help to confirm the identity of the substance causing the spot and would eliminate any potential errors or uncertainties from the first experiment.
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The volume of a sample of hydrogen gas was decreased from 10.89 L
to 4.18 L
at constant temperature. If the final pressure exerted by the hydrogen gas sample was 8.95 atm,
what pressure did the hydrogen gas exert before its volume was decreased?
Answer:
3.44 atm
Explanation:
boyles law
p1v1=p2v2
p1*10.89 L=4.18 L*8.95 atm
p1*10.89=4.18*8.95
p1*10.89 = 37.411
p1 = 37.411/10.89
p1 = 3.43535353535
1. Element X and element Y have a difference in electronegativity of 0.7; Will the bond XY be covalent or ionic? explain using electronegativity difference.
2. Which two substances would have a higher melting point. O2 or quatz (SiO2)? Explain your answer.
3. write the name of the covalent compound
Cl2O6
What is the molarity (M) of a bleach solution containing 9.50 grams of bleach (NaOCI) in 2,000 ml of solution? BLEACH
show work
The molarity of the bleach solution is 0.0637 M.
Steps
To find the molarity (M) of the bleach solution, we first need to calculate the number of moles of NaOCl present in the given mass of bleach. We can use the formula:
moles = mass / molar mass
where the molar mass of NaOCl is 74.44 g/mol.
mass of NaOCl = 9.50 g
molar mass of NaOCl = 74.44 g/mol
moles of NaOCl = 9.50 g / 74.44 g/mol = 0.1274 mol
Next, we need to calculate the volume of the solution in liters, since molarity is defined as the number of moles of solute per liter of solution:
volume of solution = 2,000 ml = 2.000 L
Now we can calculate the molarity of the bleach solution:
Molarity = moles of NaOCl / volume of solution
= 0.1274 mol / 2.000 L
= 0.0637 M
Therefore, the molarity of the bleach solution is 0.0637 M.
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At the equivalence point of a strong acid string base titration, all of the acid and base have reacted producing water and a salt
Yes, that is correct. At the equivalence point of a strong acid-strong base titration, all the acid and base have reacted completely to form water and a salt. The solution is neutral as the pH is 7. This is because the strong acid and strong base react completely in a 1:1 ratio to form the salt and water. The salt formed depends on the specific acid and base used in the reaction. For example, if hydrochloric acid (HCl) and sodium hydroxide (NaOH) are used, the salt formed would be sodium chloride (NaCl).
10. For the reaction
2C(s)+N2(g)+5H2⇌2CH3NH2(g)
with K=1.8×10−6. If you begin the reaction with 1.0 mol of N2, 2.0 mol of H2, and sufficient C(s) in a 2.00 L container, what are the concentrations of N2 and CH3NH2 at equilibrium? What happens to K if the concentration of H2 is doubled?
Answer: The balanced chemical equation for the given reaction is:
2C(s) + N2(g) + 5H2(g) ⇌ 2CH3NH2(g)
The equilibrium constant expression for the reaction is:
Kc = [CH3NH2]^2/([N2][H2]^5)
At the beginning of the reaction, the concentration of N2 is 1.0 mol/2.00 L = 0.50 M and the concentration of H2 is 2.0 mol/2.00 L = 1.0 M. The concentration of C(s) is not given, but it is assumed to be large enough that its concentration does not change significantly during the reaction. Let the concentration of CH3NH2 at equilibrium be x mol/L. Then, according to the stoichiometry of the reaction, the equilibrium concentrations of N2 and H2 are (0.50 - x) mol/L and (1.0 - 5x) mol/L, respectively.
Substituting these values into the equilibrium constant expression and solving for x, we get:
Kc = [CH3NH2]^2/([N2][H2]^5)
1.8×10−6 = x^2/[(0.50 - x)(1.0 - 5x)^5]
1.8×10−6 (0.50 - x)(1.0 - 5x)^5 = x^2
1.8×10−6 (0.50 - x)(1 - 5x)^5 = x^2
This is a cubic equation that can be solved numerically to find the value of x, which represents the equilibrium concentration of CH3NH2. Using a numerical solver, we find that x = 5.42×10^-4 M. Therefore, the equilibrium concentrations of N2 and CH3NH2 are 0.50 - x = 0.499 M and x = 5.42×10^-4 M, respectively.
If the concentration of H2 is doubled, its concentration at equilibrium becomes 2.0 M - 5x. Substituting this new value into the equilibrium constant expression, we get:
K'c = [CH3NH2]^2/([N2][H2]^5)
K'c = (x^2)/[(0.50 - x)(2.0 - 5x)^5]
The value of K'c is different from Kc because it depends on the new concentration of H2. To find the ratio of K'c to Kc, we can divide the two expressions:
K'c/Kc = [(x^2)/[(0.50 - x)(2.0 - 5x)^5]] / [(x^2)/[(0.50 - x)(1.0 - 5x)^5]]
K'c/Kc = [(2.0 - 5x)^5]/[(1.0 - 5x)^5]
Substituting x = 5.42×10^-4, we get:
K'c/Kc = [(2.0 - 5(5.42×10^-4))^5]/[(1.0 - 5(5.42×10^-4))^5]
K'c/Kc = 1.31
Therefore, if the concentration of H2 is doubled, the equilibrium constant Kc increases by a factor of 1.31.
Acceleration refers to the rate of change in an object’s 5.________
Answer:
velocity
Explanation:
Which compound would undergo nucleophilic addition? A ethene, C₂H4 B bromoethane, C₂H,Br Cethanal, CH₂CHO D ethane, C₂H6
Out of the given compounds, the one that would undergo nucleophilic addition is ethanal, CH₂CHO (option C).
What is nucleophilic addition?Nucleophilic addition is a type of chemical reaction in which a nucleophile (an electron-rich species, such as a negatively charged ion or a molecule with a lone pair of electrons) attacks an electrophilic center (an electron-poor atom or group) and forms a new covalent bond.
In this type of reaction, the nucleophile donates a pair of electrons to the electrophilic center, resulting in the formation of a new bond and the creation of a new compound.
This process can occur in various types of molecules and functional groups, but is particularly common in compounds with polar double or triple bonds, such as alkenes and alkynes, or in compounds with polar functional groups, such as carbonyl groups (C=O) and imines (C=N).
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I need the answer for number 2
Answer:
+ Triple covalent bond (CB) > double CB > single CB in terms of bond strength and energy needed to break the bonds
+ Triple bonds are the most reactive, double bonds are reactive but single bonds are unreactive
+ Single bond > double bond > triple bond in bond length
+ in single bond, 2 electrons are shared
+ in double bond, 4 electrons are shared
+ in triple bond, 6 electrons are shared
50 points
Which type of process is this.
Chemical Process
Physical Process
Nuclear Process
Explanation:
That's Nucleus process
look at the reaction and Ans
zinc carbonate+ sulfuric acid = zinc sulfate + carbon Dioxide + water
where did the hydrogen in water come from the reaction?
where did carbon from carbon dioxide come from?
In the given reaction:
zinc carbonate + sulfuric acid = zinc sulfate + carbon dioxide + water
The sulfuric acid was the source of the hydrogen in water. In the process, zinc carbonate (ZnCO3) and sulfuric acid (H2SO4) combine to create zinc sulfate (ZnSO4), carbon dioxide (CO2), and water. (H2O).
The carbon in zinc carbonate is what produces carbon dioxide (CO2). (ZnCO3). Zinc carbonate (ZnCO3) and sulfuric acid (H2SO4) interact during the process to produce zinc sulfate (ZnSO4), carbon dioxide (CO2), and water. (H2O).
The sulfuric solution is where water gets its hydrogen from. A substance called sulfuric acid is made up of the elements of hydrogen, sulfur, and oxygen.
Hydrogen ions (H+), which combine with the hydroxide ions (OH-) from the zinc carbonate to create water, are released into the solution when sulfuric acid reacts with zinc carbonate.
The carbon particle in the zinc carbonate molecule is where the carbon in carbon dioxide originates. Compounds containing zinc, carbon, and oxygen make up zinc carbonate. The carbon atom joins two oxygen atoms from the sulfuric acid during the reaction to create carbon dioxide. (CO2).
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HELPPPP
A student dissolves 0.03450 mol of solid salt in 49.83 g of distilled water and observes the temperature of the water rise from 25.2˚C to a final temperature of 31.4˚C. If the calorimeter constant is 37.4 J/˚C, what is the calculated enthalpy of the reaction of the salt in units of kJ/mol? Explain how you would go about solving the problem and show all work for each step in your solution.
The heat of reaction for the dissolution of the salt can be obtained to be 335 kJ/mol.
What is the heat capacity?Heat capacity is the amount of heat energy required to raise the temperature of a substance by a certain amount. More specifically, it is defined as the amount of heat energy required to raise the temperature of a substance by one degree Celsius or one Kelvin. The heat capacity is typically measured in units of joules per degree Celsius (J/°C) or joules per Kelvin (J/K).
We know that the heat that is absorbed can be obtained from;
H = mcdT
H = 49.83 g * 37.4 J/˚C * ( 31.4˚C - 25.2˚C)
H = 11.55 kJ
Then we have;
Hrxn = 11.55 kJ/ 0.03450 mol
= 335 kJ/mol
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In which two phase changes does energy decrease?
Answer: potential energy
Explanation: During a phase change, the heat added (PE increases) or released (PE decreases) will allow the molecules to move apart or come together. Heat absorbed causes the molecules to move farther apart by overcoming the intermolecular forces of attraction.
you’ve had a light snack that has 14 grams of glucose, 4 grams of olive oil, and 3 grams of amino acids. How many calories are in your snack?
The total number of calories in snack that has 14 grams of glucose, 4 grams of olive oil, and 3 grams of amino acids is 141calories.
Given the mass of glucose = 14g
The mass of olive oil = 4g
The mass of amino acids = 3g
To calculate the amount of calories in the snack, we first need to look at the calories per gram of each component of the snack:
Glucose: 4 calories per gram
14 grams of glucose x 4 calories per gram = 56 calories
Olive oil: 9 calories per gram
4 grams of olive oil x 9 calories per gram = 36 calories
Amino Acids: 4 calories per gram
3 grams of amino acids x 4 calories per gram = 12 calories
Now that we have the calories per gram for each component, we can add them together to get the total number of calories in the snack:
56 calories from glucose + 36 calories from olive oil + 12 calories from amino acids = 104 calories
Finally, we can add a 10% calorie adjustment for the other components of the snack (such as fat and fiber) to get the total number of calories:
104 calories + 10% (10.4 calories) = 141.4 calories
Therefore, the total number of calories in your snack is 141.
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determine the mole fraction of each component in a solution in which 3.57 g of sodium chloride (NaCI) is dissolved in 25.0 g of water. Show the steps of the calculation.
The mole fractions of water and sodium chloride in the solution are 0.9578 and 0.0422, respectively.
What is the NaCl mole fraction?If 0.010 moles of sodium chloride dissolve in 100 grammes of purified water, the mole fraction of sodium chloride and water. Water has a mole fraction of 0.982 and NaCl has a mole fraction of 0.018.
1: Determine the sodium chloride moles (NaCl)
NaCl has a molar mass of 58.44 g/mol. As a result, 3.57 g of NaCl has the following number of moles in it:
moles of NaCl = mass of NaCl / molar mass of NaCl
moles of NaCl = 3.57 g / 58.44 g/mol
moles of NaCl = 0.0612 mol
2: Determine the water moles (H2O)
Water has a molar mass of 18.02 g/mol. As a result, 25.0 g of water contains the following number of moles of water:
moles of H2O = mass of H2O / molar mass of H2O
moles of H2O = 25.0 g / 18.02 g/mol
moles of H2O = 1.388 mol
3: Determine the total moles of the solution.
The moles of NaCl and water together make up the total amount of moles in the solution.
total moles = moles of NaCl + moles of H2O
total moles = 0.0612 mol + 1.388 mol
total moles = 1.4492 mol
4: Determine the mole fraction for each element.
NaCl's mole fraction is:
mole fraction of NaCl = moles of NaCl / total moles
mole fraction of NaCl = 0.0612 mol / 1.4492 mol
mole fraction of NaCl = 0.0422
Water's mole fraction is:
mole fraction of H2O = moles of H2O / total moles
mole fraction of H2O = 1.388 mol / 1.4492 mol
mole fraction of H2O = 0.9578
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WORTH 100 POINTS, ANSWER ALL PARTS
INFO. An unknown compound containing tellurium and bromine is analyzed and it is determined that 28.53% of the compound by mass is composed of tellurium.
Part A. What quantity in moles of Te are present in 100.00 g of the compound?
Part B. What is the mass percent of Br in the compound?
Part C. What quantity in moles of Br are present in 100.00 g of the compound?
Part D. Determine the empirical formula of the unknown compound.
Part E. Provide the correct IUPAC name of the unknown compound.