Question 1

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 gF) A) and B)
G) A) and E)

Question 2

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)   5F) B) and C)
G) A) and E)

Question 3

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? 2 If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?   A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2 If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?   
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G) B) and E)

Question 4

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 gF) None of the above
G) A) and E)

Question 5

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 amuF) B) and D)
G) B) and E)

Question 6

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%F) B) and D)
G) A) and B)

Question 7

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.F) A) and E)
G) A) and C)

Question 8

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)   C2H2OF) D) and E)
G) A) and D)

Question 9

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

Accepted Answer

A)   3CHO? 
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C)   3CHO? 
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D)   3CHO? 
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G) A) and C)

Question 10

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)   24F) A) and B)
G) C) and E)

Question 11

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%F) B) and E)
G) B) and D)

Question 12

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 molF) C) and D)
G) A) and B)

Question 13

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 gF) B) and C)
G) A) and E)

Question 14

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/molF) A) and E)
G) A) and D)

Question 15

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%F) C) and D)
G) D) and E)

Question 16

________ is defined by the following equation
  × 100%

Accepted Answer

Percent by...

Question 17

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 molesF) B) and C)
G) C) and D)

Exam 3: Stoichiometry: Ratios of Combination

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?

Correct Answer
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How many moles are present in 17.4 g of lead?

Correct Answer
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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

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

Correct Answer
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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.

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

Correct Answer
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________ is defined by the following equation × 100%

Correct Answer
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Percent by...
View Answer

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

Correct Answer
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What is the mass percent of oxygen in barium perchlorate?

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

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

Correct Answer
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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)

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

Correct Answer
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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?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

Exam 3: Stoichiometry: Ratios of Combination

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?

Correct AnswerverifiedShow Answer

How many moles are present in 17.4 g of lead?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

________ is defined by the following equation × 100%

Correct AnswerverifiedPercent by...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

What is the mass percent of oxygen in barium perchlorate?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified
Percent by...
View Answer

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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)

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified