Question 1

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2
If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 2

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH3 + 5O2 → 4NO + 6H2O
What is the maximum amount of water that may be produced if 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

Accepted Answer

A)  1.56 mol 
B)  1.88 mol 
C)  3.52 mol 
D)  3.91 mol 
E)  2.35 mol

Question 3

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis, it produced 1.471 g CO2 and 0.226 g H2O. What is its empirical formula?

Accepted Answer

A)  C2H3O4 
B)  C3H4O2 
C)  C4H3O2 
D)  C5H12O4 
E)  C2H2O

Question 4

How many moles are present in 17.4 g of lead?

Accepted Answer

A)  0.0994 moles 
B)  1.05 × 1025 moles 
C)  0.0840 moles 
D)  10.06 moles 
E)  11.9 moles

Question 5

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________ Al4C3 + ________ H2O → ________ Al(OH)3 + ________ CH4

Accepted Answer

A)  3 
B)  4 
C)  6 
D)  12 
E)  24

Question 6

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

Accepted Answer

A)  0.0217 g 
B)  0.139 g 
C)  7.21 g 
D)  12.7 g 
E)  46.0 g

Question 7

What is the mass percent of oxygen in barium perchlorate?

Accepted Answer

A)  4.7% 
B)  8.5% 
C)  23.4% 
D)  38.1% 
E)  19.0%

Question 8

Methanol (CH3OH) is converted to bromomethane (CH3Br) as follows: CH3OH + HBr → CH3Br + H2O
If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percentage yield?

Accepted Answer

A)  12.9% 
B)  33.8% 
C)  40.9% 
D)  59.1% 
E)  82.6%

Question 9

Calculate the molar mass of Ca(BO2)2·6H2O.

Accepted Answer

A)  273.87 g/mol 
B)  233.80 g/mol 
C)  183.79 g/mol 
D)  174.89 g/mol 
E)  143.71 g/mol

Question 10

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________ Na + ________ H2O → ________ NaOH + ________ H2

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 11

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas. If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P4O6, what is the percent yield for the reaction?

Accepted Answer

A)  57.5% 
B)  48.8% 
C)  38.0% 
D)  89.4% 
E)  16.3%

Question 12

Potassium chloride is used as a substitute for sodium chloride for individuals with high blood pressure. Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

Accepted Answer

A)  Chlorine is the limiting reactant; 1.14 g of potassium remain. 
B)  Potassium is the limiting reactant; 2.00 g of chlorine remain. 
C)  Potassium is the limiting reactant; 2.47 g of chlorine remain. 
D)  Chlorine is the limiting reactant; 3.07 g of potassium remain. 
E)  Potassium is the limiting reactant; 4.50 g of chlorine remain.

Question 13

Which could represent the reaction mixture after the complete combustion of acetaldehyde, CH3CHO?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 14

________ is defined by the following equation
  × 100%

Accepted Answer

The answer of ________ is defined by the following equation
...

Question 15

How many grams are contained in a 0.893 mol sample of methane, CH4?

Accepted Answer

A)  1.48 × 10-24 g 
B)  5.38 × 1023 g 
C)  8.64 × 1024 g 
D)  14.3 g 
E)  18.0 g

Question 16

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S8? 8Fe(s) + S8(s) → 8FeS(s)

Accepted Answer

A)  186 g 
B)  142 g 
C)  119 g 
D)  14.8 g 
E)  0.169 g

Question 17

Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and the manufacture of antiperspirants. Calculate its formula mass.

Accepted Answer

A)  450.06 amu 
B)  342.17 amu 
C)  315.15 amu 
D)  278.02 amu 
E)  74.98 amu

Exam 3: Stoichiometry: Ratios of Combination

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW₂ If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH₃ + 5O₂→ 4NO + 6H₂O What is the maximum amount of water that may be produced if 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis, it produced 1.471 g CO₂ and 0.226 g H₂O. What is its empirical formula?

How many moles are present in 17.4 g of lead?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? Al₄C₃ + H₂O → Al(OH) ₃ + CH₄

Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

What is the mass percent of oxygen in barium perchlorate?

Methanol (CH₃OH) is converted to bromomethane (CH₃Br) as follows: CH₃OH + HBr → CH₃Br + H₂O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percentage yield?

Calculate the molar mass of Ca(BO₂) ₂·6H₂O.

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? Na + H₂O → NaOH + H₂

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas. If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P₄O₆, what is the percent yield for the reaction?

Potassium chloride is used as a substitute for sodium chloride for individuals with high blood pressure. Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

Which could represent the reaction mixture after the complete combustion of acetaldehyde, CH₃CHO?

________ is defined by the following equation × 100%

How many grams are contained in a 0.893 mol sample of methane, CH₄?

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S₈? 8Fe(s) + S₈(s) → 8FeS(s)

Aluminum sulfate, Al₂(SO₄) ₃, is used in tanning leather, purifying water, and the manufacture of antiperspirants. Calculate its formula mass.

Exam 3: Stoichiometry: Ratios of Combination

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2 If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH3 + 5O2 → 4NO + 6H2O What is the maximum amount of water that may be produced if 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis, it produced 1.471 g CO2 and 0.226 g H2O. What is its empirical formula?

How many moles are present in 17.4 g of lead?

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________ Al4C3 + ________ H2O → ________ Al(OH) 3 + ________ CH4

Calculate the mass in grams of 8.35 × 1022 molecules of CBr4.

What is the mass percent of oxygen in barium perchlorate?

Methanol (CH3OH) is converted to bromomethane (CH3Br) as follows: CH3OH + HBr → CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percentage yield?

Calculate the molar mass of Ca(BO2) 2·6H2O.

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________ Na + ________ H2O → ________ NaOH + ________ H2

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas. If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P4O6, what is the percent yield for the reaction?

Potassium chloride is used as a substitute for sodium chloride for individuals with high blood pressure. Identify the limiting reactant and determine the mass of the excess reactant remaining when 7.00 g of chlorine gas reacts with 5.00 g of potassium to form potassium chloride.

Which could represent the reaction mixture after the complete combustion of acetaldehyde, CH3CHO?

________ is defined by the following equation × 100%

How many grams are contained in a 0.893 mol sample of methane, CH4?

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S8? 8Fe(s) + S8(s) → 8FeS(s)

Aluminum sulfate, Al2(SO4) 3, is used in tanning leather, purifying water, and the manufacture of antiperspirants. Calculate its formula mass.

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW₂ If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor as follows: 4NH₃ + 5O₂→ 4NO + 6H₂O What is the maximum amount of water that may be produced if 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon, hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to combustion analysis, it produced 1.471 g CO₂ and 0.226 g H₂O. What is its empirical formula?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? Al₄C₃ + H₂O → Al(OH) ₃ + CH₄

Calculate the mass in grams of 8.35 × 10²² molecules of CBr₄.

Methanol (CH₃OH) is converted to bromomethane (CH₃Br) as follows: CH₃OH + HBr → CH₃Br + H₂O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percentage yield?

Calculate the molar mass of Ca(BO₂) ₂·6H₂O.

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? Na + H₂O → NaOH + H₂

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas. If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P₄O₆, what is the percent yield for the reaction?

Which could represent the reaction mixture after the complete combustion of acetaldehyde, CH₃CHO?

How many grams are contained in a 0.893 mol sample of methane, CH₄?

What mass of FeS is formed if 9.42 g of Fe reacts with 68.0 g of S₈? 8Fe(s) + S₈(s) → 8FeS(s)

Aluminum sulfate, Al₂(SO₄) ₃, is used in tanning leather, purifying water, and the manufacture of antiperspirants. Calculate its formula mass.