Question 1

The molecular formula of aspartame,the generic name of NutraSweet®,is C14H18N2O5.What is the mass (g) of 1.00 mol of aspartame?

Accepted Answer

A)  24
B)  156
C)  294
D)  43
E)  39F) B) and D)
G) A) and B)

Question 2

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass.What is the empirical formula of the compound?

Accepted Answer

A)  CH2
B)  C2H4
C)  CH4
D)  C4H8
E)  C86H14F) C) and D)
G) A) and D)

Question 3

A nitrogen oxide is 63.65% by mass nitrogen.The molecular formula could be ________.

Accepted Answer

A)  NO
B)  NO2
C)  N2O
D)  N2O4
E)  either NO2 or N2O4F) B) and E)
G) None of the above

Question 4

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) 
In a particular experiment,2.50-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

Accepted Answer

A)  2.51
B)  2.09
C)  12.5
D)  4.18
E)  6.2F) A) and B)
G) A) and C)

Question 5

GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3GeF4 → 4GeF3H
If the reaction yield is 89.1%,how many moles of GeH4 are needed to produce 3.50 mol of GeF3H?

Accepted Answer

A)  15.7
B)  3.93
C)  0.982
D)  0.875
E)  2.95F) B) and D)
G) D) and E)

Question 6

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO2 and 70.44 grams of H2O.What is the empirical formula of the alcohol?

Accepted Answer

Question 7

A 30.5 gram sample of glucose (C6H12O6) contains ________ mol of glucose.

Accepted Answer

A)  0.424
B)  0.169
C)  5.90
D)  2.36
E)  0.136F) None of the above
G) A) and E)

Question 8

Calculate the percentage by mass of carbon in CO2.

Accepted Answer

A)  27.29
B)  75.10
C)  73.05
D)  72.71
E)  37.53F) A) and D)
G) C) and D)

Question 9

Calculate the percentage by mass of hydrogen in PtCl2(NH3) 2.

Accepted Answer

A)  1.558
B)  1.008
C)  0.672
D)  0.034
E)  2.016F) A) and E)
G) D) and E)

Question 10

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) 
________ grams of lead (II) oxide will be produced by the decomposition of 8.75 g of lead (II) carbonate?

Accepted Answer

A)  10.5
B)  2.50
C)  0.033
D)  7.31
E)  8.75F) All of the above
G) A) and B)

Question 11

The formula weight of PbCO3 is ________ amu.

Accepted Answer

A)  279.2
B)  112.0
C)  118.0
D)  267.2
E)  235.2F) A) and D)
G) A) and E)

Question 12

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) 
How many moles of lithium are needed to produce 0.45 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

Accepted Answer

A)  0.23
B)  1.4
C)  0.15
D)  0.30
E)  2.7F) A) and D)
G) C) and D)

Question 13

The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g) 
The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

Accepted Answer

A)  13.5
B)  28.8
C)  54.1
D)  47.3
E)  94.6F) B) and C)
G) A) and D)

Question 14

The combustion of propane (C3H8)in the presence of excess oxygen yields CO2 and H2O:
C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g)
How many grams of CO2 is produced when 12.5 g of C3H8 burns in open air?

Accepted Answer

Question 15

Combustion of a 0.9827-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.900 g of CO2 and 1.070 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  C2H5O
B)  C5H7O3
C)  C4H11O2
D)  C4H10O
E)  C2H5O2F) A) and D)
G) None of the above

Question 16

What is the empirical formula of a compound that contains 49.4% K,20.3% S,and 30.3% O by mass?

Accepted Answer

A)  KSO2
B)  KSO3
C)  K2SO4
D)  K2SO3
E)  KSO4F) A) and B)
G) A) and C)

Question 17

1 mole of which of the following will have the largest mass?

Accepted Answer

A)  rubidium
B)  magnesium
C)  gold
D)  neon
E)  1 mole of any element will contain the same mass.F) D) and E)
G) None of the above

Question 18

When the following equation is balanced,the coefficients are ________. Al(NO3) 3 + Na2S → Al2S3 + NaNO3

Accepted Answer

A)  2, 3, 1, 6
B)  2, 1, 3, 2
C)  1, 1, 1, 1
D)  4, 6, 3, 2
E)  2, 3, 2, 3F) All of the above
G) A) and B)

Question 19

When the following equation is balanced,the coefficients are ________. 2 → CO2 + H2O A) 4, 50, 16, 18 B) 1, 5, 2, 2 C) 2, 2, 7, 1 D) 1, 13, 8, 9 E) 2, 25, 16, 18" class="answers-bank-image d-inline" rel="preload" > 2 → CO2 + H2O A) 4, 50, 16, 18 B) 1, 5, 2, 2 C) 2, 2, 7, 1 D) 1, 13, 8, 9 E) 2, 25, 16, 18" class="answers-bank-image d-inline" rel="preload" > + O2 → CO2 + H2O

Accepted Answer

A)  4, 50, 16, 18
B)  1, 5, 2, 2
C)  2, 2, 7, 1
D)  1, 13, 8, 9
E)  2, 25, 16, 18F) A) and C)
G) A) and B)

Question 20

When the following equation is balanced,the coefficient of HNO3 is ________. HNO3 (aq) + CaCO3 (s) → Ca(NO3) 2 (aq) + CO2 (g) + H2O (l)

Accepted Answer

A)  1
B)  2
C)  3
D)  5
E)  4F) A) and B)
G) A) and C)

Exam 3: Chemical Reactions and Reaction Stoichiometry

The molecular formula of aspartame,the generic name of NutraSweet®,is C14H18N2O5.What is the mass (g) of 1.00 mol of aspartame?

Correct AnswerverifiedShow Answer

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) In a particular experiment,2.50-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

Correct AnswerverifiedShow Answer

Combustion of a 0.9827-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.900 g of CO2 and 1.070 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

A compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass.What is the empirical formula of the compound?

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Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO3 (s) → PbO (s) + CO2 (g) ________ grams of lead (II) oxide will be produced by the decomposition of 8.75 g of lead (II) carbonate?

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A 30.5 gram sample of glucose (C6H12O6) contains ________ mol of glucose.

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The formula weight of PbCO3 is ________ amu.

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1 mole of which of the following will have the largest mass?

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A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO2 and 70.44 grams of H2O.What is the empirical formula of the alcohol?

Correct AnswerverifiedShow Answer

The combustion of propane (C3H8)in the presence of excess oxygen yields CO2 and H2O: C3H8 (g)+ 5O2 (g)→ 3CO2 (g)+ 4H2O (g) How many grams of CO2 is produced when 12.5 g of C3H8 burns in open air?

Correct AnswerverifiedShow Answer

GeF3H is formed from GeH4 and GeF4 in the combination reaction: GeH4 + 3GeF4 → 4GeF3H If the reaction yield is 89.1%,how many moles of GeH4 are needed to produce 3.50 mol of GeF3H?

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When the following equation is balanced,the coefficient of HNO3 is ________. HNO3 (aq) + CaCO3 (s) → Ca(NO3) 2 (aq) + CO2 (g) + H2O (l)

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When the following equation is balanced,the coefficients are ________. + O2 → CO2 + H2O

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A nitrogen oxide is 63.65% by mass nitrogen.The molecular formula could be ________.

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Calculate the percentage by mass of carbon in CO2.

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Calculate the percentage by mass of hydrogen in PtCl2(NH3) 2.

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When the following equation is balanced,the coefficients are ________. Al(NO3) 3 + Na2S → Al2S3 + NaNO3

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The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

Correct AnswerverifiedShow Answer

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) → 2Li3N (s) How many moles of lithium are needed to produce 0.45 mol of Li3N when the reaction is carried out in the presence of excess nitrogen?

Correct AnswerverifiedShow Answer

What is the empirical formula of a compound that contains 49.4% K,20.3% S,and 30.3% O by mass?

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The molecular formula of aspartame,the generic name of NutraSweet^®,is C₁₄H₁₈N₂O_5.What is the mass (g) of 1.00 mol of aspartame?

Correct Answer
verified

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) In a particular experiment,2.50-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

Correct Answer
verified

Combustion of a 0.9827-g sample of a compound containing only carbon,hydrogen,and oxygen produced 1.900 g of CO₂ and 1.070 g of H₂O.What is the empirical formula of the compound?

Correct Answer
verified

Correct Answer
verified

Lead (II) carbonate decomposes to give lead (II) oxide and carbon dioxide: PbCO₃(s) → PbO (s) + CO₂(g) ________ grams of lead (II) oxide will be produced by the decomposition of 8.75 g of lead (II) carbonate?

Correct Answer
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A 30.5 gram sample of glucose (C₆H₁₂O₆) contains ________ mol of glucose.

Correct Answer
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The formula weight of PbCO₃ is ________ amu.

Correct Answer
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Correct Answer
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A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 60.00 gram sample of the alcohol produced 114.6 grams of CO₂ and 70.44 grams of H₂O.What is the empirical formula of the alcohol?

Correct Answer
verified

The combustion of propane (C₃H₈)in the presence of excess oxygen yields CO₂ and H₂O: C₃H₈ (g)+ 5O₂ (g)→ 3CO₂(g)+ 4H₂O (g) How many grams of CO₂ is produced when 12.5 g of C₃H₈ burns in open air?

Correct Answer
verified

GeF₃H is formed from GeH₄ and GeF₄in the combination reaction: GeH₄ + 3GeF₄ → 4GeF₃H If the reaction yield is 89.1%,how many moles of GeH₄ are needed to produce 3.50 mol of GeF₃H?

Correct Answer
verified

When the following equation is balanced,the coefficient of HNO₃ is ________. HNO₃(aq) + CaCO₃(s) → Ca(NO₃) ₂ (aq) + CO₂(g) + H₂O (l)

Correct Answer
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When the following equation is balanced,the coefficients are ________. + O₂ → CO₂ + H₂O

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Correct Answer
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Calculate the percentage by mass of carbon in CO₂.

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Calculate the percentage by mass of hydrogen in PtCl₂(NH₃) ₂.

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When the following equation is balanced,the coefficients are ________. Al(NO₃) ₃ + Na₂S → Al₂S₃ + NaNO₃

Correct Answer
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The combustion of ammonia in the presence of excess oxygen yields NO₂ and H₂O: 4 NH₃ (g) + 7 O₂ (g) → 4 NO₂ (g) + 6 H₂O (g) The combustion of 14.4 g of ammonia consumes ________ g of oxygen.

Correct Answer
verified

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N₂(g) → 2Li₃N (s) How many moles of lithium are needed to produce 0.45 mol of Li₃N when the reaction is carried out in the presence of excess nitrogen?

Correct Answer
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Correct Answer
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