Question 1

If 2.5 moles of each of these compounds are burned completely in O₂, which will produce the largest amount of CO₂?

Accepted Answer

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Question 2

The titration of 25.00 mL of 0.2215 M HCl required 28.84 mL of NaOH for neutralization. What is the molarity of NaOH?

Accepted Answer

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Question 3

If liquid mercury and oxygen combine to make mercury(II)oxide, what is the percentage yield of HgO if 350.0 g of Hg( l )react with 150.0 g of O₂( g )to produce 272.3 g of the product?

Accepted Answer

The theoretical yield of HgO can be calculated using stoichiometry. The balanced equation is 2Hg + O2 → 2HgO. The molar mass of Hg is 200.59 g/mol, so 350.0 g of Hg is 1.745 mol. The molar mass of O2 is 32.00 g/mol, so 150.0 g of O2 is 4.688 mol. Hg is the limiting reactant. The theoretical yield of HgO is 1.745 mol × 216.59 g/mol = 377.8 g. The percentage yield is (272.3 g / 377.8 g) × 100% = 72.07%.

Question 4

Ammonia is manufactured using the following reaction: N₂+ 3H₂→ 2NH₃. How much ammonia can be produced in the reaction of 2.04 × 10^{− 3}moles of nitrogen and 6.83 × 10^{− 3}moles of hydrogen?

Accepted Answer

The reaction is balanced as 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Given 2.04 × 10^−3 moles of N2 and 6.83 × 10^−3 moles of H2, N2 is the limiting reactant. Thus, 2.04 × 10^−3 moles of N2 will produce 2 × 2.04 × 10^−3 = 4.08 × 10^−3 moles of NH3.

Question 5

If 15.00 mL of a 1.00 M HCl solution is mixed with 25.00 mL of a 0.250 M NaOH solution in a process that produces 273 mg of NaCl, what is the percentage yield of NaCl?

Accepted Answer

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Question 6

If 92.8 g of sodium nitrite is dissolved in 2.3 L of water, the resulting solution has a molarity of:

Accepted Answer

To find the molarity, divide the number of moles of solute by the volume of the solution in liters. The molar mass of sodium nitrite (NaNO2) is approximately 69 g/mol. Therefore, 92.8 g corresponds to 92.8 g / 69 g/mol = 1.3449 mol. The molarity is then 1.3449 mol / 2.3 L = 0.58 M.

Question 7

If 8.42 × 10^{− 2}moles of aluminum react with 1.77 × 10^{− 2}moles of chlorine gas, how many moles of AlCl₃ can form?

Accepted Answer

The balanced reaction is 2Al + 3Cl2 → 2AlCl3. The limiting reactant is Cl2, and using stoichiometry, 1.77 × 10^−2 moles of Cl2 will produce 1.18 × 10^−2 moles of AlCl3.

Question 8

If 60.6 g of aluminum powder reacts with 125 g of iron(III)oxide, how much iron metal can be recovered?

Accepted Answer

The balanced chemical equation for the reaction is: 2Al + Fe2O3 → 2Fe + Al2O3. The molar mass of Al is 26.98 g/mol, Fe2O3 is 159.7 g/mol, and Fe is 55.85 g/mol. Calculate moles of Al and Fe2O3, determine the limiting reactant, and use stoichiometry to find the mass of Fe produced. The limiting reactant is Fe2O3, and it produces 87.4 g of Fe.

Question 9

An ethanol plant begins a production run with sufficient reactants and predicts a theoretical yield of 1250 metric tons of ethanol. The process produces 1178.6 metric tons. What is the percentage yield for this production run?

Accepted Answer

The percentage yield is calculated by dividing the actual yield by the theoretical yield and then multiplying by 100. (1178.6 / 1250) * 100 = 94.29%.

Question 10

A 118.63 g of SrCl₂∙ 6H₂O was heated and 34.81 g of water was recovered from the sample. What percent of the original H₂O remains in the sample following this heating process?

Accepted Answer

The correct answer is A because 27.61% of the original H2O remains in the sample following this heating process.

Question 11

A meat preservation technique requires sodium nitrite. The preservative is prepared by streaming NO( g )and O₂( g )through Na₂CO₃( aq )as seen in the reaction below . What is the percentage yield for this reaction if the addition of 12.73 g of NO( g ), 16.49 g of O₂( g ), and 35.82 g of Na₂CO₃( aq )result in the formation of 16.81 g of NaNO₂. NO( g )+ O₂( g )+ Na₂CO₃( aq )→ NaNO₂( aq )+ CO₂( g )

Accepted Answer

The limiting reactant is NO, and the theoretical yield is 18.28 g of NaNO2. The percentage yield is (16.81 g / 18.28 g) * 100% = 57.43%.

Question 12

A 25.00 mL sample of vinegar is titrated to neutralization with 22.64 mL of 2.00 M NaOH. What is the molarity of the vinegar?

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Question 13

A series of ant bites inject 45 μ g of formic acid (HCOOH)into a patient's skin. Considering formic acid is a monoprotic acid (donates one H⁺), how much baking soda (NaHCO₃)is required to neutralize the acid?

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Question 14

Limestone (CaCO₃)emits CO₂gas when exposed to HCl as shown in the reaction below . What is the theoretical yield of CO₂if 9.45 g of limestone is completely dissolved in HCl? CaCO₃( s )+ 2HCl( aq )→ CaCl₂( aq )+ CO₂( g )+ H₂O( l )

Accepted Answer

The molar mass of CaCO3 is 100.09 g/mol, and the molar mass of CO2 is 44.01 g/mol. From 9.45 g of CaCO3, the moles of CaCO3 are 9.45 g / 100.09 g/mol = 0.0944 mol. The reaction shows a 1:1 molar ratio between CaCO3 and CO2, so 0.0944 mol of CO2 is produced. The mass of CO2 is 0.0944 mol * 44.01 g/mol = 4.16 g.

Question 15

During a tuning test, an automobile engine consumes 4.40 × 10^{− 3}moles of octane and 5.50 × 10^{− 2}moles of oxygen. What condition best describes the fuel mix?

Accepted Answer

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Question 16

A 2.0 L vessel is filled with 7.3 × 10^{− 4}moles of hydrogen and 6.8 × 10^{− 4}moles of oxygen. How much water can be produced?

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Question 17

Phosgene is produced in the reaction of carbon monoxide with chlorine gas in the following reaction: CO( g )+ Cl₂( g )→ COCl₂( g ). What is the theoretical yield of phosgene if 0.767 moles of CO react with excess Cl₂gas?

Accepted Answer

The theoretical yield of phosgene is 76.0 g. This is because the mole ratio of CO to COCl2 is 1:1, so 0.767 moles of CO will react to produce 0.767 moles of COCl2. The molar mass of COCl2 is 98.92 g/mol, so the theoretical yield is 0.767 moles * 98.92 g/mol = 76.0 g.

Question 18

The Haber process is used to synthesize ammonia from hydrogen and nitrogen. How much hydrogen gas is required to produce 42.8 kg of ammonia?

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Question 19

What is the theoretical yield of AgCl if 30.2 mL of 0.1000 M AgNO₃reacts with an excess of 0.10000 M HCl?

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Question 20

Automobile airbags employ a chemical reaction involving the rapid decomposition of sodium azide (NaN₃)into sodium metal and nitrogen gas to inflate in a collision. How much sodium azide is required to decompose to inflate a 20.0 L air bag? Assume that the gas is at standard temperature and pressure, and thus occupies 22.4 L per mole.

Accepted Answer

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Quiz 4: Stoichiometry

If 2.5 moles of each of these compounds are burned completely in O₂, which will produce the largest amount of CO₂?

The titration of 25.00 mL of 0.2215 M HCl required 28.84 mL of NaOH for neutralization. What is the molarity of NaOH?

If liquid mercury and oxygen combine to make mercury(II) oxide, what is the percentage yield of HgO if 350.0 g of Hg( l ) react with 150.0 g of O₂( g ) to produce 272.3 g of the product?

Ammonia is manufactured using the following reaction: N₂+ 3H₂→ 2NH₃. How much ammonia can be produced in the reaction of 2.04 × 10^{− 3}moles of nitrogen and 6.83 × 10^{− 3}moles of hydrogen?

If 15.00 mL of a 1.00 M HCl solution is mixed with 25.00 mL of a 0.250 M NaOH solution in a process that produces 273 mg of NaCl, what is the percentage yield of NaCl?

If 92.8 g of sodium nitrite is dissolved in 2.3 L of water, the resulting solution has a molarity of:

If 8.42 × 10^{− 2}moles of aluminum react with 1.77 × 10^{− 2}moles of chlorine gas, how many moles of AlCl₃ can form?

If 60.6 g of aluminum powder reacts with 125 g of iron(III) oxide, how much iron metal can be recovered?

An ethanol plant begins a production run with sufficient reactants and predicts a theoretical yield of 1250 metric tons of ethanol. The process produces 1178.6 metric tons. What is the percentage yield for this production run?

A 118.63 g of SrCl₂∙ 6H₂O was heated and 34.81 g of water was recovered from the sample. What percent of the original H₂O remains in the sample following this heating process?

A 25.00 mL sample of vinegar is titrated to neutralization with 22.64 mL of 2.00 M NaOH. What is the molarity of the vinegar?

A series of ant bites inject 45 μ g of formic acid (HCOOH) into a patient's skin. Considering formic acid is a monoprotic acid (donates one H⁺) , how much baking soda (NaHCO₃) is required to neutralize the acid?

Limestone (CaCO₃) emits CO₂gas when exposed to HCl as shown in the reaction below . What is the theoretical yield of CO₂if 9.45 g of limestone is completely dissolved in HCl? CaCO₃( s ) + 2HCl( aq ) → CaCl₂( aq ) + CO₂( g ) + H₂O( l )

During a tuning test, an automobile engine consumes 4.40 × 10^{− 3}moles of octane and 5.50 × 10^{− 2}moles of oxygen. What condition best describes the fuel mix?

A 2.0 L vessel is filled with 7.3 × 10^{− 4}moles of hydrogen and 6.8 × 10^{− 4}moles of oxygen. How much water can be produced?

Phosgene is produced in the reaction of carbon monoxide with chlorine gas in the following reaction: CO( g ) + Cl₂( g ) → COCl₂( g ) . What is the theoretical yield of phosgene if 0.767 moles of CO react with excess Cl₂gas?

The Haber process is used to synthesize ammonia from hydrogen and nitrogen. How much hydrogen gas is required to produce 42.8 kg of ammonia?

What is the theoretical yield of AgCl if 30.2 mL of 0.1000 M AgNO₃reacts with an excess of 0.10000 M HCl?

Quiz 4: Stoichiometry

If 2.5 moles of each of these compounds are burned completely in O2, which will produce the largest amount of CO2?

The titration of 25.00 mL of 0.2215 M HCl required 28.84 mL of NaOH for neutralization. What is the molarity of NaOH?

If liquid mercury and oxygen combine to make mercury(II) oxide, what is the percentage yield of HgO if 350.0 g of Hg( l ) react with 150.0 g of O2( g ) to produce 272.3 g of the product?

Ammonia is manufactured using the following reaction: ​ N2+ 3H2→ 2NH3. ​ How much ammonia can be produced in the reaction of 2.04 × 10 − 3moles of nitrogen and 6.83 × 10 − 3moles of hydrogen?

If 15.00 mL of a 1.00 M HCl solution is mixed with 25.00 mL of a 0.250 M NaOH solution in a process that produces 273 mg of NaCl, what is the percentage yield of NaCl?

If 92.8 g of sodium nitrite is dissolved in 2.3 L of water, the resulting solution has a molarity of:

If 8.42 × 10 − 2moles of aluminum react with 1.77 × 10 − 2moles of chlorine gas, how many moles of AlCl3 can form?

If 60.6 g of aluminum powder reacts with 125 g of iron(III) oxide, how much iron metal can be recovered?

An ethanol plant begins a production run with sufficient reactants and predicts a theoretical yield of 1250 metric tons of ethanol. The process produces 1178.6 metric tons. What is the percentage yield for this production run?

A 118.63 g of SrCl2∙ 6H2O was heated and 34.81 g of water was recovered from the sample. What percent of the original H2O remains in the sample following this heating process?

A 25.00 mL sample of vinegar is titrated to neutralization with 22.64 mL of 2.00 M NaOH. What is the molarity of the vinegar?

A series of ant bites inject 45 μ g of formic acid (HCOOH) into a patient's skin. Considering formic acid is a monoprotic acid (donates one H+) , how much baking soda (NaHCO3) is required to neutralize the acid?

Limestone (CaCO3) emits CO2gas when exposed to HCl as shown in the reaction below . What is the theoretical yield of CO2if 9.45 g of limestone is completely dissolved in HCl? ​ CaCO3( s ) + 2HCl( aq ) → CaCl2( aq ) + CO2( g ) + H2O( l )

During a tuning test, an automobile engine consumes 4.40 × 10 − 3moles of octane and 5.50 × 10 − 2moles of oxygen. What condition best describes the fuel mix?

A 2.0 L vessel is filled with 7.3 × 10 − 4moles of hydrogen and 6.8 × 10 − 4moles of oxygen. How much water can be produced?

Phosgene is produced in the reaction of carbon monoxide with chlorine gas in the following reaction: ​ CO( g ) + Cl2( g ) → COCl2( g ) . ​ What is the theoretical yield of phosgene if 0.767 moles of CO react with excess Cl2gas?

The Haber process is used to synthesize ammonia from hydrogen and nitrogen. How much hydrogen gas is required to produce 42.8 kg of ammonia?

What is the theoretical yield of AgCl if 30.2 mL of 0.1000 M AgNO3reacts with an excess of 0.10000 M HCl?

If 2.5 moles of each of these compounds are burned completely in O₂, which will produce the largest amount of CO₂?

If liquid mercury and oxygen combine to make mercury(II) oxide, what is the percentage yield of HgO if 350.0 g of Hg( l ) react with 150.0 g of O₂( g ) to produce 272.3 g of the product?

Ammonia is manufactured using the following reaction: N₂+ 3H₂→ 2NH₃. How much ammonia can be produced in the reaction of 2.04 × 10^{− 3}moles of nitrogen and 6.83 × 10^{− 3}moles of hydrogen?

If 8.42 × 10^{− 2}moles of aluminum react with 1.77 × 10^{− 2}moles of chlorine gas, how many moles of AlCl₃ can form?

A 118.63 g of SrCl₂∙ 6H₂O was heated and 34.81 g of water was recovered from the sample. What percent of the original H₂O remains in the sample following this heating process?

A series of ant bites inject 45 μ g of formic acid (HCOOH) into a patient's skin. Considering formic acid is a monoprotic acid (donates one H⁺) , how much baking soda (NaHCO₃) is required to neutralize the acid?

Limestone (CaCO₃) emits CO₂gas when exposed to HCl as shown in the reaction below . What is the theoretical yield of CO₂if 9.45 g of limestone is completely dissolved in HCl? CaCO₃( s ) + 2HCl( aq ) → CaCl₂( aq ) + CO₂( g ) + H₂O( l )

During a tuning test, an automobile engine consumes 4.40 × 10^{− 3}moles of octane and 5.50 × 10^{− 2}moles of oxygen. What condition best describes the fuel mix?

A 2.0 L vessel is filled with 7.3 × 10^{− 4}moles of hydrogen and 6.8 × 10^{− 4}moles of oxygen. How much water can be produced?

Phosgene is produced in the reaction of carbon monoxide with chlorine gas in the following reaction: CO( g ) + Cl₂( g ) → COCl₂( g ) . What is the theoretical yield of phosgene if 0.767 moles of CO react with excess Cl₂gas?

What is the theoretical yield of AgCl if 30.2 mL of 0.1000 M AgNO₃reacts with an excess of 0.10000 M HCl?