There are approximately 2.526 × 10^26 atoms of O in 46.6 moles of Al2(CO3)3.
Steps
To find the number of atoms of O in 46.6 moles of Al2(CO3)3, we need to first calculate the total number of moles of O in the compound and then multiply it by Avogadro's number.
The molecular formula of Al2(CO3)3 shows that there are three O atoms per one CO3 group, and there are three CO3 groups per one Al2(CO3)3 molecule. Therefore, the total number of O atoms in one Al2(CO3)3 molecule is:
3 O atoms/CO3 group × 3 CO3 groups/Al2(CO3)3 molecule = 9 O atoms/Al2(CO3)3 molecule
Next, we need to calculate the total number of moles of O atoms in 46.6 moles of Al2(CO3)3:
46.6 moles Al2(CO3)3 × 9 O atoms/Al2(CO3)3 molecule = 419.4 moles O atoms
Finally, we can calculate the total number of O atoms by multiplying the number of moles of O by Avogadro's number:
419.4 moles O atoms × 6.022 × 10^23 atoms/mole = 2.526 × 10^26 O atoms
Therefore, there are approximately 2.526 × 10^26 atoms of O in 46.6 moles of Al2(CO3)3.
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A natural gas (CH4) furnace leaks into the room which is at one atmospheric
pressure and 18°C. The flammability limits of methane are approximately 0.5 to
1.6. When this room is closed and leak tight, it would take between 38 – 56 hours
to reach flammability range. What would you predict happens when the same
scenario occurs in a home in the mountains of New Mexico where the atmospheric
pressure is 0.89 atm? Explain in terms of combustible range and relative ratios.
b) Where do you expect to find methane “residues” in a room?
The flammability of natural gas ranges from 5 to 15 percent. This indicates that no combustion would take place in any mixture with a natural gas to air ratio of less than 5% or greater than 15%.
50% LEL methane – what is it?The lowest concentration of a gas at which combustion can occur is known as the LEL. A reading in%LEL measures the percentage of that LEL value. The LEL, for instance, is 5% by volume for methane. Half of that amount, or 2.5% by volume, is 50% LEL.
How do you determine methane's LEL?Divide the unknown concentration by the LEL specified in the NFPA Handbook to determine the LEL of any gas in air.
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I've tried so many times and cant get this right
Answer:
where is the other temperature? so i can help you
Determine the overall orders of the reactions to which the following rate laws apply:a.rate=k[NO2]2 b.rate=k c.rate=k[H2][Br2]12 d.rate=k[NO]2[O2]
a. The rate law rate=k[NO2]^2 indicates that the reaction is second order with respect to NO2.
b. The rate law rate=k indicates that the reaction is zero order with respect to the reactant(s).
c. The rate law rate=k[H2][Br2]^1/2 indicates that the reaction is first order with respect to H2 and half-order with respect to Br2. Therefore, the overall order of the reaction is 1 + 1/2 = 3/2 order.
d. The rate law rate=k[NO]^2[O2] indicates that the reaction is third order overall. The reaction is second order with respect to NO and first order with respect to O2.
The term "rate law" is commonly used to refer to the integrated rate law. K in a rate law is the rate constant, a value specific to each reaction that determines the rate of reaction. Orders in a rate law describe the dependency of the reaction rate on the concentration of each reactant, with each reactant having its own order. The overall reaction order is the sum of the individual orders, which can be determined through experiments.
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The total enzyme concentration is [Et]=________ nM, if [S]=6mM, Vo=480 nM/min, Km = 4
uM, and the catalytic rate constant (kcat) of the enzyme is 20. min-1
The total enzyme concentration [Et] is 6 nM.
Enzyme concentration is the amount of an enzyme present in a given solution. The concentration of enzymes can have an effect on the rate of reaction. If the concentration of enzymes is higher, the rate of reaction will be faster, and if the concentration of enzymes is lower, the rate of reaction will be slower.Enzyme concentration is important because it can affect the outcome of a reaction, and therefore, it must be carefully monitored.
The total enzyme concentration [Et] can be calculated using the Michaelis-Menten equation, which states that[tex]Vo= [Et] * kcat * (\frac{[S]}{Km} + [S])[/tex]
Plugging in the given values, we get:
[tex]480 nM/min = [Et] * 20 min^{-1}* (\frac{6mM}{4uM} + 6mM)[/tex]
Solving for [Et], we get:
[Et] = 6 nM
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How many total atoms are there in 62.5 g
of carbon disulfide ( CS2)?
Total atoms:
The answer is [tex]4.94 x 10^23[/tex] atoms.
To determine the total number of atoms in 62.5 g of carbon disulfide (CS2), we need to use Avogadro's number and the molecular weight of CS2.
The molecular weight of CS2 is:
Carbon atomic weight = 12.01 g/mol
Sulfur atomic weight = 32.06 g/mol
2 sulfur atoms x 32.06 g/mol + 1 carbon atom x 12.01 g/mol = 76.13 g/mol
Now, we can use the formula:
Number of moles = mass ÷ molecular weight
Number of moles of CS2 = 62.5 g ÷ 76.13 g/mol = 0.821 mol
Finally, we can use Avogadro's number, which is[tex]6.022 x 10^23[/tex] atoms per mole, to calculate the total number of atoms in 62.5 g of CS2:
Total atoms = Number of moles × Avogadro's number
Total atoms = 0.821 mol ×[tex]6.022 x 10^23[/tex] atoms/mol
Total atoms =[tex]4.94 x 10^23[/tex] atoms
Therefore, there are approximately[tex]4.94 x 10^23[/tex]atoms in 62.5 g of carbon disulfide (CS2).
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can someone balance?
__Fe+__HCl=__FeCl2+__H2
[tex]Fe +2 HCl[/tex] yields [tex]FeCl_2[/tex] and [tex]H_2[/tex]. One atom of [tex]Fe[/tex] combines with two compounds of [tex]HCl[/tex] to create 1 molecule of [tex]FeCl_2[/tex] or one molecule of [tex]H_2[/tex], as shown by the equation's balanced form. [tex]2Fe + 2HCl = 2FeCl_2 + H_2[/tex]
What is the balanced chemical equation?A mathematical statement known as an equation is created when two expressions are joined by the equal sign. An example is [tex]3x - 5[/tex] 16 in mathematics. By resolving this equation, we may find that the variable x has a value of 7.
[tex]Fe^ +2[/tex] [tex]HCl[/tex] produces [tex]H_2[/tex] and [tex]FeCl2.[/tex] According to the equation's balanced version, one atom of Fe reacts with two [tex]HCl[/tex] molecules to make one molecule of [tex]FeCl_2[/tex] or one molecule of [tex]H_2[/tex].
Therefore, [tex]2Fe + 2HCl = 2FeCl_2 + H_2[/tex] one atom of Fe reacts with two [tex]HCl[/tex] molecules to make one molecule of [tex]FeCl_2[/tex] or one molecule of [tex]H_2[/tex].
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At what temperature can you fully dissolve 140g of NaNO3?
Answer: The solubility of NaNO3 (sodium nitrate) in water increases as temperature increases. Therefore, we need to know the solubility of NaNO3 at different temperatures to determine the temperature at which 140 g of NaNO3 can be fully dissolved in water.
According to the solubility curve for NaNO3, the maximum solubility of NaNO3 in water is approximately 88 g per 100 g of water at 80°C. This means that at 80°C, we can dissolve 88 g of NaNO3 in 100 g of water to make a saturated solution.
To fully dissolve 140 g of NaNO3, we need to dissolve it in a sufficient amount of water that can dissolve at least 140 g of NaNO3. Using a proportion, we can calculate the amount of water required to dissolve 140 g of NaNO3 at 80°C:
88 g NaNO3 / 100 g water = 140 g NaNO3 / x g water
Solving for x, we get:
x = 159.1 g water
This means that at 80°C, we need to dissolve 140 g of NaNO3 in at least 159.1 g of water to make a saturated solution, in which all of the NaNO3 will be dissolved.
Therefore, the temperature at which 140 g of NaNO3 can be fully dissolved in water is approximately 80°C.
Explanation:
SO4+BaCl2 double replacement
A double replacement is Na2SO4 (aq) + BaCl2 BaSO4 (s) + 2 NaCl (aq) + 2 NaCl (aq). The reaction Na2SO4 + BaCl2 is endothermic. When barium chloride (BaCl2) and sodium sulphate (Na2SO4) combine, sodium chloride and barium sulphate are formed.
What is the chemical formula for barium chloride's double replacement?When Sodium sulphate(Na 2 SO 4) interacts with Barium chloride solution (), a white precipitate of Barium sulphate() and Sodium chloride is generated.
When barium chloride is introduced to dilute sulphuric acid, a white precipitate of barium sulphate forms as a result of barium displacement from its chloride, as seen below: BaCl2 + H2SO4 BaSO4 + 2HCl.
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4 grams of a gas at 200 k and 8 atmospheres occupies a volume of 20 liters. use relationships from avogadro's law, boyle's law, charles's law, and the ideal gas law to solve this problem.
The number of particles in the gas is [tex]4.72 * 10^{24}[/tex], the volume of the gas at 4 atm is 40 L, and the volume of the gas at 300 K is 30 L.
Avogadro's Law: Equal volumes of gases at the same temperature and pressure contain equal numbers of particles (molecules or atoms).
Boyle's Law: For a fixed amount of gas at a constant temperature, the pressure and volume are inversely proportional to each other.
Charles's Law: For a fixed amount of gas at a constant pressure, the volume and temperature are directly proportional to each other.
PV = nRT is the formula for the ideal gas law,
where P is pressure, V is volume, n is the number of molecules of gas, R is gas constant, and T is temperature in Kelvin.
Mass of gas (m) = 4 g
Temperature (T) = 200 K
Pressure (P) = 8 atm
Volume (V) = 20 L
First, we can use the ideal gas law to calculate the number of moles of gas:
n = PV/RT
n = (8 atm * 20 L) / (0.0821 L.atm/mol.K * 200 K)
n = 7.85 moles
Next, we can use Avogadro's Law to find the number of particles (molecules or atoms):
1 mole of gas = [tex]6.02 * 10^23[/tex] particles
7.85 moles of gas =[tex]7.85 * 6.02 * 10^23[/tex]particles
= [tex]4.72 * 10^24[/tex] particles
We can also use Boyle's Law and Charles's Law to find the volume of the gas at different conditions:
Boyle's Law:
[tex]P_1V_1 = P_2V_2[/tex]
If we keep the temperature constant at 200 K, we can use this relationship to find the volume of the gas at a different pressure. Let's say we want to know the volume of the gas at 4 atm:
[tex]P_1[/tex] = 8 atm
[tex]V_1[/tex] = 20 L
[tex]P_2[/tex] = 4 atm
[tex]V_2[/tex]= ?
[tex]P_1V_1 = P_2V_2[/tex]
8 atm x 20 L = 4 atm x [tex]V_2[/tex]
[tex]V_2[/tex] = (8 atm x 20 L) / 4 atm
[tex]V_2[/tex] = 40 L
Charles's Law:
[tex]V1/T1 = V2/T2[/tex]
If we keep the pressure constant at 8 atm, we can use this relationship to find the volume of the gas at a different temperature.
Let's say we want to know the volume of the gas at 300 K:
[tex]V_1[/tex] = 20 L
[tex]T_1[/tex]= 200 K
[tex]V_2[/tex] = ?
[tex]T_2[/tex] = 300 K
[tex]V_1/T_1 = V_2/T_2[/tex]
20 L / 200 K = [tex]V_2[/tex] / 300 K
[tex]V_2[/tex] = (20 L / 200 K) x 300 K
[tex]V_2[/tex] = 30 L
Therefore, the number of particles in the gas is [tex]4.72 * 10^{24}[/tex], the volume of the gas at 4 atm is 40 L, and the volume of the gas at 300 K is 30 L.
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Calculate the pH of 0.16M Ch3cooh which has ka = 1.74 × 10^ -5 mol dm^-3.
Answer: 2.78
Explanation:
To calculate the pH of 0.16M CH3COOH, we need to use the dissociation constant (Ka) of the acid, which is given as 1.74 × 10^-5 mol dm^-3.
The dissociation of CH3COOH is as follows:
CH3COOH + H2O ↔ CH3COO- + H3O+
The equilibrium constant expression for the dissociation of CH3COOH is:
Ka = [CH3COO-][H3O+] / [CH3COOH]
We can assume that [H3O+] is equal to [CH3COO-] since the acid is weak and will not dissociate completely. Therefore, the equilibrium constant expression can be simplified as:
Ka = [H3O+]^2 / [CH3COOH]
[H3O+]^2 = Ka x [CH3COOH]
[H3O+]^2 = 1.74 × 10^-5 x 0.16
[H3O+]^2 = 2.784 × 10^-6
[H3O+] = √2.784 × 10^-6
[H3O+] = 0.00167 M
Therefore, the pH of the solution can be calculated as:
pH = -log[H3O+]
pH = -log(0.00167)
pH = 2.78
Therefore, the pH of the 0.16M CH3COOH solution is 2.78.
Write the molecular equation and net ionic equation for the reaction of hydroiodic acid and potassium hydroxide. Include phases (states). Enter the formula for water as H2O
find the molar equation and net ionic equation.
The Molecular Equation is : [tex]HI (aq) + KOH (aq) \rightarrow KI (aq) + H_2O (l)[/tex]
The Net Ionic Equation is : [tex]H^+(aq) + OH^-(aq) \rightarrow H_2O(l)[/tex]
This reaction is an acid-base neutralization reaction. Hydroiodic acid (HI) is an acid and potassium hydroxide (KOH) is a base. When the two react, they form water ([tex]H_2O[/tex]) and potassium iodide (KI).[tex]H_2O[/tex] is a chemical formula for water, which consists of two hydrogen atoms and one oxygen atom. Water is a fundamental component of life and is essential for all forms of life on Earth. The reaction is a double displacement reaction, where the positively charged cations, potassium (K⁺) and hydrogen (H⁺), switch places with each other in the reactants to form the products.
It is possible to describe the as:
[tex]HI (aq) + KOH (aq) \rightarrow KI (aq) + H_2O (l)[/tex]
One way to express the net-ionic equation is as follows:
[tex]H^+(aq) + OH^-(aq) \rightarrow H_2O(l)[/tex]
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if the [H+] of a solution is 8.4 x 10-3 mol/L the pOH of the solution is
The pOH of the solution is 10.92.
Calculation-Equation: The relationship between a solution's pH and pOH is:
pH + pOH = 14
where pH is equal to the negative logarithm of the concentration of hydrogen ions (H+), and pOH is equal to the negative logarithm of the concentration of hydroxide ions (OH-).
We must first determine the [OH-] concentration to determine the solution's pOH. We can apply the following:
Kw = [H+][OH-] = 1.0 x 10^-14 at 25°C
where Kw is the water-specific ion product constant.
If we rewrite this equation, we obtain:
[OH-] = Kw/[H+] = 1.0 x 10^-14 / 8.4 x 10^-3 = 1.19 x 10^-11 mol/L
We can now calculate pOH's value using the definition of the term:
pOH = -log[OH-] = -log(1.19 x 10^-11) = 10.92
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PLEASE HELP ASAP!!
Consider FIVE types of solids:
Ionic (NaCl)
Metallic (Ca)
Covalent Network (Quartz, SiO2)
Polar Molecular (sugar, C6H12O6)
Non-polar molecule
RECALL THE PHYSICAL PROPERTIES -> hardness, brittleness, the conductivity of electricity and heat, melting and boiling points, solubility in water, etc.
1. Design an experimental procedure to test these properties with the procedures below.
-> the ones I have so far
- ionic solids -> use NaCl and dissolve in water to test the solubility
- conductivity - by putting the solid under two free ends of the wire
-> solubility - using boiling water for all as ionic solids break into ions & conduct electricity
- brittleness - using a hammer or any other form of stress (if brittle, tends to break under stress)
- hardness - using a hydraulic press/Rockwell testing
- melting/boiling point - add heat to a sample after placing in a beaker or test tube to test
SOME OTHER THINGS WE CAN USE (but I'm unsure as to what we can use it for): a thermal camera
2. WRITE A HYPOTHESIS for ONE TYPE of solid with a brief explanation.
3. Design a Table of Observations for your experiments.
The tests that can be used to determine the kinds of solids that have been listed are shown below.
What are the solid types?Here are some tests that can be used to show that a solid is:
Ionic (NaCl):
Solubility test: NaCl is highly soluble in water, and a high degree of solubility can confirm the ionic nature of NaCl.
Conductivity test: In its molten or dissolved state, NaCl conducts electricity due to the presence of charged ions.
Metallic (Ca):
Conductivity test: Metals such as Ca conduct electricity due to the presence of free electrons in their crystal structure.
Ductility and malleability test: Metals are ductile and malleable, and can be easily deformed under pressure.
Covalent Network (Quartz, SiO2):
Hardness test: Covalent network solids such as quartz are extremely hard due to the strong covalent bonds between atoms.
Melting point test: Covalent network solids often have high melting and boiling points due to the strong intermolecular forces between atoms.
Polar Molecular (sugar, C6H12O6):
Solubility test: Polar molecules such as sugar are soluble in polar solvents such as water but insoluble in nonpolar solvents.
Melting and boiling point test: Polar molecular solids have lower melting and boiling points compared to ionic or covalent network solids due to weaker intermolecular forces.
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A particular form of electromagnetic radiation has a frequency of 6.24 × 1014 Hz.
What is its wavelength in nanometers? In meters? Enter your answers in scientific notation.
CH3CHCHCHCH3 with two CH3 groups and an OH group attached IUPAC name
The IUPAC name for the given molecule, which has four carbon atoms, one OH group, and two methyl (CH3) groups attached, is:
4-methyl-2-pentanol
What is IUPAC?
It is an international organization that aims to advance the chemical sciences and to contribute to the application of chemistry in the service of humankind.
Identify the longest carbon chain that contains the functional group (OH). In this case, the longest chain has five carbon atoms.
Number the carbon atoms in the chain, starting from the end that is closest to the functional group (OH). In this case, we can number the chain from left to right, so that the OH group is on carbon atom 2.
Identify and name the substituents (groups) attached to the main chain. In this case, there are two methyl (CH3) groups attached to carbon atoms 4 and 5, respectively.
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25 points!! And i’ll give brainliest!
Asap
1.
100 grams of ethanol were dissolved in 2 kg of water.
Calculate the boiling and freezing points of the formed solution.
2.
80 grams of benzoic acid were dissolved in 800 g of water. Calculate the boiling and freezing points of the formed solution.
To solve both problems, we need to use the equations for calculating boiling point elevation and freezing point depression:
Boiling point elevation: ΔTb = Kb x molality
Freezing point depression: ΔTf = Kf x molality
where:
ΔTb is the boiling point elevation or increase in boiling pointΔTf is the freezing point depression or decrease in freezing pointKb is the molal boiling point elevation constant for the solventKf is the molal freezing point depression constant for the solventmolality is the concentration of the solute in mol/kg of solventFor both problems, we assume that the solute is completely dissolved in the solvent and that the resulting solution is ideal.
First, we need to calculate the molality of the ethanol solution:
molality = moles of solute / mass of solvent in kg
moles of ethanol = 100 g / 46.07 g/mol = 2.17 molmass of water = 2 kg = 2000 gmolality = 2.17 mol / 2 kg = 1.09 mol/kgNext, we need to find the boiling point elevation and freezing point depression:
ΔTb = Kb x molality
ΔTf = Kf x molality
For water, Kb = 0.512 °C/m and Kf = 1.86 °C/m.
ΔTb = 0.512 °C/m x 1.09 mol/kg = 0.558 °C
ΔTf = 1.86 °C/m x 1.09 mol/kg = 2.03 °C
Therefore, the boiling point of the solution is 100 + 0.558 = 100.558 °C, and the freezing point is 0 - 2.03 = -2.03 °C.
2. First, we need to calculate the molality of the benzoic acid solution:
molality = moles of solute / mass of solvent in kg
moles of benzoic acid = 80 g / 122.12 g/mol = 0.655 molmass of water = 800 g = 0.8 kgmolality = 0.655 mol / 0.8 kg = 0.819 mol/kgNext, we need to find the boiling point elevation and freezing point depression:
ΔTb = Kb x molality
ΔTf = Kf x molality
For water, Kb = 0.512 °C/m and Kf = 1.86 °C/m.
ΔTb = 0.512 °C/m x 0.819 mol/kg = 0.419 °C
ΔTf = 1.86 °C/m x 0.819 mol/kg = 1.52 °C
Therefore, the boiling point of the solution is 100 + 0.419 = 100.419 °C, and the freezing point is 0 - 1.52 = -1.52 °C.
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Ammonia (NH3) chemically reacts with oxygen gas (O2) to produce nitric oxide (NO) and water (H2O).
What mass of water is produced by the reaction of 1.06 of oxygen gas?
Round your answer to 3 significant digits.
The mass of water, H₂O produced by the reaction of 1.06 grams of oxygen gas, O₂ is 0.72 grams
How do I determine the mass of water, H₂O produced?The mass of water, H₂O produced by the reaction of 1.06 grams of oxygen gas, O₂ can be obtained as shown below:
The balanced equation for the reaction is given below
4NH₃ + 5O₂ -> 4NO + 6H₂O
Molar mass of O₂ = 32 g/molMass of O₂ from the balanced equation = 5 × 32 = 160 g Molar mass of H₂O = 18 g/molMass of H₂O from the balanced equation = 6 × 18 = 108 gFrom the balanced equation above,
160 g of oxygen gas, O₂ reacted to produce 108 g of water, H₂O
Therefore,
1.06 g of oxygen gas, O₂ will react to produce = (1.06 × 108) / 160 = 0.72 g of water, H₂O
Thus, the mass of water, H₂O produced from the reaction is 0.72 g
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Define which are endothermic and exothermic
NaOH (s) → NaOH (aq)
NH4Cl (s) → NH4Cl (aq)
CaCl2 (s) → CaCl2 (aq)
HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
NaCl (s) → NaCl (aq)
Answer: NaOH (s) → NaOH (aq) is an exothermic process because energy is released when solid NaOH dissolves in water to form an aqueous solution.
NH4Cl (s) → NH4Cl (aq) is also an exothermic process for the same reason as NaOH above.
CaCl2 (s) → CaCl2 (aq) is also an exothermic process because energy is released when solid CaCl2 dissolves in water to form an aqueous solution.
HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) is an exothermic process because energy is released as the acid-base reaction occurs and the products are formed.
NaCl (s) → NaCl (aq) is not an endothermic or exothermic process since there is no change in the state of the substance (solid to aqueous solution) and therefore no energy is either absorbed or released.
Explanation: Endothermic and exothermic refer to processes that either require energy to be absorbed or release energy to the surroundings.
In the given reactions, NaOH, NH4Cl, and CaCl2 dissolve in water to form aqueous solutions, and in doing so, they release energy to the surroundings, making these processes exothermic.
The reaction between HCl and NaOH also releases energy as the products are formed, and so it is also exothermic.
However, in the case of NaCl, there is no change in the state of the substance, and so no energy is either absorbed or released, making it neither endothermic nor exothermic.
What mass of carbon dioxide is produced from the complete combustion of 8.40x10-3g of methane?
The mass of carbon dioxide produced from the complete combustion of 8.40x10^-3 g of methane is 0.023 g.
What is mass ?
Mass can be defined as the measure of the amount of matter in a body.
The balanced chemical equation for the complete combustion of methane (CH4) is:
CH4 + 2O2 → CO2 + 2H2O
This equation tells us that one mole of methane reacts with two moles of oxygen gas (O2) to produce one mole of carbon dioxide (CO2) and two moles of water (H2O).
We can use the molar mass of methane and the balanced equation to determine the amount of carbon dioxide produced from the given mass of methane.
First, we need to convert the mass of methane to moles:
moles of CH4 = mass / molar mass = 8.40x10^-3 g / 16.04 g/mol = 5.239x10^-4 moles
Next, we can use the balanced equation to find the number of moles of CO2 produced:
1 mole of CH4 produces 1 mole of CO2
So, 5.239x10^-4 moles of CH4 will produce 5.239x10^-4 moles of CO2.
Finally, we can use the molar mass of carbon dioxide to convert moles to grams:
mass of CO2 = moles of CO2 × molar mass of CO2
mass of CO2 = 5.239x10^-4 moles × 44.01 g/mol = 0.023 g
Therefore, the mass of carbon dioxide produced from the complete combustion of 8.40x10^-3 g of methane is 0.023 g.
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PLS HELP ANWSER THIS QUESTIONS ILL GIVE YOU BRAINLIST PLEASE HELP
A sample of gas at 32.6 torr and 735 K is heated to 1035 K. What is the new pressure of the gas?
Answer: The answer for this question is 45.9.
Explanation: Since there are numbers with different significant figures, the number or numbers that have less significant figures will be the one you round to. In this case, the numbers in the problem are 32.6,735, and 1035. Since we need to find the numbers that have the least significant figures, the numbers 32.6 and 735 have three significant figures while 1035 has 4 significant figures. Since we need to choose the numbers that have the least significant figures, these numbers are 32.6 and 735 since they have three significant figures. Round your answer to three significant figures and you get 45.9 as your answer.
Please does anyone know how to answer these questions?
Given that we don't have the equation mentioned in the question, I will assume that the equation is referred to is the following:
2N2(g) + 5O2(g) → 2N2O5(g)
a) If you start with 2 moles of O2, according to the equation, 5 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (2/5) x 2 = 0.8 moles.
b) If you start with 1 mole of O2, according to the equation, 5/2 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (1/(5/2)) x 2 = 0.4 moles.
c) If you start with 1 mole of N2, according to the equation, 5/2 moles of O2 are needed to react with 2 moles of N2. Therefore, the number of moles of N2O5 created would be (5/2) x 1 = 2.5 moles.
d) If you get 6 moles of N2O5 during your reaction, according to the equation, 2 moles of N2O5 are produced for every 5 moles of O2 used. Therefore, the number of moles of O2 needed would be (5/2) x (6/2) = 7.5 moles.
e) If you get 6 moles of N2O5 during your reaction, according to the equation, 2 moles of N2O5 are produced for every 2 moles of N2 used. Therefore, the number of moles of N2 needed would be (2/2) x (6/2) = 3 moles.
Names: The chemical names for the compounds involved in the equation are:
O2: Oxygen gas
N2: Nitrogen gas
N2O5: Dinitrogen pentoxide gas
Steps
A chemical reaction between nitrogen and oxygen is represented by the balanced chemical equation 2N2(g) + 5O2(g) 2N2O5(g). The quantities of the reactants and products used in this reaction were questioned.
We may use stoichiometry to determine the mole ratio of O2 to N2O5, which will allow us to calculate how many moles of N2O5 is generated when 2 moles of O2 are consumed.
The equation shows that in order to produce 2 moles of N2O5, 5 moles of O2 must react with 2 moles of N2. The result is the production of (2/5) x 2 = 0.8 moles of N2O5.
Similar calculations can be used to determine how many moles of N2O5 are created when 1 mole of O2 or 1 mole of N2 is used.
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PLEASE HELP ASAP!!
Consider FIVE types of solids:
Ionic (NaCl)
Metallic (Ca)
Covalent Network (Quartz, SiO2)
Polar Molecular (sugar, C6H12O6)
Non-polar molecule
RECALL THE PHYSICAL PROPERTIES -> hardness, brittleness, the conductivity of electricity and heat, melting and boiling points, solubility in water, etc.
1. Design an experimental procedure to test these properties with the procedures below.
-> the ones I have so far
- ionic solids -> use NaCl and dissolve in water to test the solubility
- conductivity - by putting the solid under two free ends of the wire
-> solubility - using boiling water for all as ionic solids break into ions & conduct electricity
- brittleness - using a hammer or any other form of stress (if brittle, tends to break under stress)
- hardness - using a hydraulic press/Rockwell testing
- melting/boiling point - add heat to a sample after placing in a beaker or test tube to test
SOME OTHER THINGS WE CAN USE (but I'm unsure as to what we can use it for): a thermal camera
2. WRITE A HYPOTHESIS for ONE TYPE of solid with a brief explanation.
3. Design a Table of Observations for your experiments.
Hypothesis: Increasing the cooling rate during the solidification of aluminum will result in a finer grain structure in the final solid.
What is one example of hypothesis and explain?When a liquid metal such as aluminum is cooled and solidified, the atoms in the liquid begin to arrange themselves into a crystalline structure. The rate at which this happens can have a significant effect on the final microstructure of the solid. If the cooling rate is slow, larger grains will form as the atoms have more time to move and arrange themselves into larger clusters. If the cooling rate is faster, there is less time for the atoms to move and larger clusters cannot form, resulting in a finer grain structure. Therefore, the hypothesis proposes that increasing the cooling rate during the solidification of aluminum will lead to a finer grain structure in the final solid. This hypothesis could be tested by varying the cooling rate during the solidification process and then examining the microstructure of the resulting solid.
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Hypothesis: Increasing the cooling rate during the solidification of aluminium will result in a finer grain structure in the final solid.
What are the solid types?The following methods can be used to demonstrate whether a solid is:
Ionic (NaCl):
Solubility test: Since NaCl is extremely soluble in water, its ionic nature can be verified by this fact.
Conductivity test: NaCl transmits electricity when it is molten or dissolved because it contains charged ions.
Metallic (Ca):
Conductivity test: Due to the existence of free electrons within their crystal structure, metals like calcium carry electricity.
Ductility and malleability test: Due to their malleability and ductility, metals are readily deformed when under pressure.
Covalent Network (Quartz, SiO2):
Hardness test: Because of the intense covalent bonds between atoms, covalent network solids like quartz are exceedingly hard.
Melting point test: Due to the powerful intermolecular forces between atoms, covalent network solids frequently have high melting and boiling points.
Polar Molecular (sugar, C6H12O6):
Solubility test: Sugar and other polar compounds can dissolve in polar solvents like water but cannot dissolve in nonpolar solvents.
Melting and boiling point test: Due to weaker intermolecular interactions, polar molecular solids have lower melting and boiling points than ionic or covalent network solids.
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(b) A 10.32g of AlCl3 are allowed to vapourize in 1dm³ vessel at 80°C a pressure of 1.7 x 10 NM2 develops. What is the degree of association into AICI3 into Al2Cl6?
The degree of association of AlCl3 into Al2Cl6 is 0.663. The degree of association of AlCl3 into Al2Cl6 can be determined using the ideal gas law and the van't Hoff factor.
Firstly, we need to calculate the number of moles of AlCl3 present in the vessel using the formula n = m/M, where m is the mass of AlCl3 and M is the molar mass of AlCl3.
n = 10.32g / 133.34 g/mol = 0.0774 mol
Next, we can use the ideal gas law equation PV = nRT to calculate the number of moles of particles in the gas phase. Rearranging this equation, we get:
n = PV/RT
where P is the pressure, V is the volume, R is the gas constant and T is the temperature in Kelvin.
n = (1.7 x 10 N/m²) x 1 dm³ / (8.31 J/mol/K x 353 K) = 7.55 x 10⁻⁴ mol
The van't Hoff factor (i) is the ratio of the actual number of particles in solution to the number of formula units dissolved. For a completely dissociated compound, the van't Hoff factor is equal to the number of ions produced. In the case of AlCl3, it undergoes a degree of association to form Al2Cl6, so the van't Hoff factor is less than 1.
We can now use the formula i = 1 + (α - 1)β, where α is the degree of association and β is the number of particles in solution per formula unit. For AlCl3, β = 4 (AlCl3 contains one Al and three Cl atoms), and assuming a degree of association of x, we get:
i = 1 + (x - 1) x 4 = 4x - 3
Substituting the values for n and i into the equation n = iC, where C is the concentration in mol/dm³, we get:
7.55 x 10^-4 mol = (4x - 3) C
Solving for x, we get:
x = 0.663
Therefore, the degree of association of AlCl3 into Al2Cl6 is 0.663.
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What is the molarity (M) of a solution made by dissolving 75 g of Epsom salt (MgSO,) in 2.3 Liters of solution?
SHOW WORK
The molarity of a solution made by dissolving 75 g of Epsom salt in 2.3 liters of solution would be 0.27 M.
Molarity calculationThe first step in calculating the molarity of the solution is to determine the number of moles of MgSO4 dissolved in 2.3 liters of solution.
The molar mass of MgSO4 is:
24.31 g/mol (for Mg) + 32.06 g/mol (for S) + 4x16.00 g/mol (for 4 O) = 120.37 g/mol
The number of moles of MgSO4 can be calculated using the formula:
moles = mass / molar mass
moles = 75 g / 120.37 g/mol = 0.623 moles
Next, we need to calculate the molarity (M) of the solution, which is defined as the number of moles of solute (MgSO4) per liter of solution:
Molarity = moles of solute / liters of solution
Molarity = 0.623 moles / 2.3 L = 0.27 M
Therefore, the molarity of the solution made by dissolving 75 g of Epsom salt (MgSO4) in 2.3 Liters of solution is 0.27 M.
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50 points
what type of process is this
chemical
physical
nuclear
Answer:
Nucular
Explanation:
When one atom splits into 2, it's nucular
Iron reacts with oxygen gas to form a mixture of FeO and Fe₂O₃ when the supply of oxygen is regulated. A sample of 20.00 g iron metal reacts with oxygen gas to form 27.55 g iron oxide mixture, and all of the iron metal was consumed. What is the mass in g of FeO that were produced in the mixture?
The mass in of [tex]FeO[/tex] that were produced in the mixture is 8.49g when a sample of 20.00 g iron metal reacts with oxygen gas to form 27.55 g iron oxide mixture.
Given the mass of iron metal = 20.00g
The mass of iron oxide = 27.55g
Iron reacts with oxygen gas to form a mixture of [tex]FeO[/tex] and [tex]Fe2O3[/tex].
The reaction is as follows: [tex]3Fe + 2O2 --- > FeO + Fe2O3[/tex]
The mass of [tex]FeO[/tex] produced in the mixture can be determined using the following equation:
Mass of [tex]FeO[/tex] = Mass of Iron Oxide Mixture – Mass of [tex]Fe2O3[/tex]
Mass of [tex]FeO[/tex] = 27.55 g - Mass of [tex]Fe2O3[/tex]
as we can see from reaction that 3 moles of iron react to give 1 mole of [tex]Fe2O3[/tex] and 1 mole of [tex]FeO[/tex].
The molar mass of Fe (iron) is = 55.85g/mole and molar mass of [tex]Fe2O3[/tex] = 159.69g/mole
3 * 55.85g of Fe produces 1 * 159.69g of [tex]Fe2O3[/tex]
Then 20.00g of iron produces = 20 * 159.69/3 * 55.85 = 19.06g of [tex]Fe2O3[/tex]
Hence mass of [tex]FeO[/tex] produced = 27.55 - 19.06 = 8.49g
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Match the following phase changes to their energy flow.
Evaporation
Melting
Freezing
Sublimation
Condensation
Deposition
[Choose]
[Choose]
Energy both absorbed and released
Energy absorbed
No energy flow
Energy released
[Choose]
[Choose]
[Choose ]
[Choose
Whereas freezing, condensation, or deposition are exothermic processes, fusion, vaporisation, and were endothermic processes. Changes in a system's energy occur together every phase transition.
During a phase change, what energy is altered?Potential energy is the type of energy that is transforming during a phase change. Either elevated body temperature (PE increases) and released (PE drops) throughout a phase change will permit the molecules either move apart or join together.
What 4 phase modifications are there?Melting is the process of changing from of the solid to liquid state. freezing: the transformation of a liquid into a solid. The process of evaporation is the change from a liquid to a gas. Condensing: The change from a gaseous to a liquid state.
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0.487 grams of quinine (molar mass = 324 g/mol) is combusted and found to produce
1.321 g CO2, 0.325 g H2O and 0.0421 g nitrogen. Determine the empirical and molecular
formulas.
molar mass of empirical formula = (20 x 12.01 g/mol) + (24 x 1.01 g/mol) + (1 x 14.01 g/mol) = 324.44 g/mol ratio = 324.44 g/mol / 324 g/mol = 1.001. The molecular formula of quinine is C20H24N.
What is used for quinine?The active component of cinchona extracts, which have been used for this purpose since before 1633, is utilized as an antimalarial medication. Quinine has been utilized in conventional cold remedies for its use as a mild antipyretic and analgesic.
What drug is quinine?Plasmodium falciparum malaria is treated with quinine. Malaria is brought on by the parasite Plasmodium falciparum, which enters the body through the red blood cells. Quinine functions by either eliminating the parasite or halting its growth.
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HELP
If you measured out 49.93 mL of a 1.000 M sodium hydroxide solution, how many moles of sodium hydroxide would be present?
Answer: 0.0499 moles of sodium hydroxide
Explanation:
We can determine the number of moles by using the Molarity equation:
Molarity = Moles / Volume (volume is always in Liters)
We have 2 out of 3 components of this equation
Molarity = 1.000 M
Volume = 49.93 mL / 1000 = 0.0499 L
So we rearrange the equation like the following:
Moles = Molarity x volume
= 1.000 Mx 0.0499 L
= 0.0499 moles of sodium hydroxide