Question 1

Sorbose,C6H12O6,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

Accepted Answer

A)  12
B)  6.04
C)  4.32 × 102
D)  36
E)  2.99F) C) and D)
G) B) and E)

Question 2

What is the mass in grams of one propene,C3H6,molecule?

Accepted Answer

A)  6.99× 10-23 g
B)  2.53 × 1025 g
C)  44.0 g
D)  42.0 g
E)  1.99 × 10-23 gF) C) and E)
G) A) and E)

Question 3

The empirical formula of butadiene is C2H3.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

Accepted Answer

A)  C5H10
B)  C2H3
C)  C4H6
D)  C3H8
E)  C6H9F) B) and D)
G) A) and B)

Question 4

Consider the following reaction:
2A + B → 3C + D
3) 0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?

Accepted Answer

A)  75 %
B)  67 %
C)  89 %
D)  50 %
E)  100 %F) A) and B)
G) C) and D)

Question 5

Calculate the number of moles of bromine present in 20.5 mL of Br2(l) ,whose density is 3.12 g/mL.

Accepted Answer

A)  2.50 mol
B)  0.257 mol
C)  0.801 mol
D)  0.128 mol
E)  0.400 molF) A) and B)
G) A) and C)

Question 6

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO2 and H2O are produced.The hydrocarbon could be

Accepted Answer

A)  C3H4.
B)  C5H10.
C)  C2H3.
D)  CH3.
E)  C3H5.F) D) and E)
G) B) and C)

Question 7

A sample of an oxide of antimony (Sb) contained 48.5 g of antimony combined with 15.9 g of oxygen.What is the simplest formula for the oxide?

Accepted Answer

A)  SbO2
B)  SbO
C)  Sb2O3
D)  Sb3O
E)  Sb2O5F) A) and E)
G) C) and E)

Question 8

A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO2 and 0.6474 g of H2O.What is the empirical formula of the compound?

Accepted Answer

A)  C3H6O3
B)  C3H3O
C)  C2H4O
D)  C2H2O
E)  CH2O3F) C) and E)
G) A) and B)

Question 9

One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate according to the following balanced chemical equation:
Rh2(SO4) 3(aq) + 6NaOH(aq) → 2Rh(OH) 3(s) + 3Na2SO4(aq) 
What mass of sodium hydroxide is required to precipitate 68.0 g of rhodium(III) hydroxide from a solution containing excess rhodium(III) sulfate?

Accepted Answer

A)  5.88 g
B)  53 g
C)  17.6 g
D)  204 g
E)  68 gF) A) and C)
G) A) and E)

Question 10

Complete combustion of a 0.40-mol sample of a hydrocarbon,CxHy,gives 2.40 mol of CO2 and 1.60 mol of H2O.The molecular formula of the original hydrocarbon is

Accepted Answer

A)  C2H8.
B)  C6H8.
C)  C9H16.
D)  C5H5.
E)  C4H7.F) A) and E)
G) B) and E)

Question 11

A 4.94-g sample of an oxide of chromium contains 3.06 g of chromium.Calculate the simplest formula for the compound.

Accepted Answer

A)  CrO5
B)  Cr2O
C)  CrO2
D)  CrO
E)  Cr2O3F) B) and E)
G) B) and D)

Question 12

How many moles of hexachlorobenzene,C6Cl6,are in 5.44 g of C6Cl6?

Accepted Answer

A)  0.0254 mol
B)  1.55 × 103 mol
C)  0.0755 mol
D)  0.019 mol
E)  0.0394 molF) A) and E)
G) B) and C)

Question 13

Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass.What is its empirical formula?

Accepted Answer

A)  CF2
B)  C2F3
C)  CF3
D)  C2F5
E)  CFF) A) and B)
G) A) and E)

Question 14

Which one of the following contains 4.21 × 1024 atoms?

Accepted Answer

A)  91 g C2H2
B)  168 g O2
C)  56 g CH4
D)  294 g N2
E)  28 g HeF) C) and E)
G) D) and E)

Question 15

2KHCO3(s) → K2CO3(s) + CO2(g) + H2O(l) 
How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

Accepted Answer

A)  2.43 mol
B)  3.52 mol
C)  17.4 mol
D)  244 mol
E)  4.87 molF) A) and B)
G) A) and C)

Question 16

A sample of 496 g of white phosphorus,P4,contains the same number of atoms as

Accepted Answer

A)  192 g of ozone (O3) .
B)  56 g of nitrogen (N2) .
C)  92 g of sodium.
D)  120 g of formaldehyde (CH2O) .
E)  128 g of oxygen (O2) .F) A) and B)
G) B) and D)

Question 17

Which of the following samples contains the smallest number of molecules?

Accepted Answer

A)  5.00 g of TNT,C7H5N3O6
B)  5.00 g of benzene,C6H6
C)  5.00 g of glucose,C6H12O6
D)  5.00 g of naphthalene,C10H8
E)  5.00 g of formaldehyde,CH2OF) B) and C)
G) A) and C)

Question 18

The analysis of an organic compound showed that it contained 0.630 mol of C,0.0300 mol of H,0.420 mol of O,and 0.210 mol of N.How many nitrogen atoms are there in the empirical formula for this compound?

Accepted Answer

A)  10
B)  7
C)  2
D)  4
E)  3F) C) and D)
G) B) and C)

Question 19

Calculate the number of moles of O2 required to react with phosphorus to produce 3.56 g of P4O6.(Molar mass P4O6 = 219.9 g/mol)

Accepted Answer

A)  0.0162 mol
B)  0.111 mol
C)  0.0486 mol
D)  0.0324 mol
E)  0.097 molF) C) and E)
G) D) and E)

Question 20

How many moles of silver are contained in 7.00 kg of silver?

Accepted Answer

A)  64.9 mol
B)  64.9 × 101 mol
C)  64.9 × 10-3 mol
D)  64.9 × 103 mol
E)  64.9 × 10-1 molF) A) and B)
G) B) and D)

Exam 3: Calculations With Chemical Formulas and Equations

Sorbose,C₆H₁₂O₆,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

Correct Answer
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Calculate the number of moles of bromine present in 20.5 mL of Br₂(l) ,whose density is 3.12 g/mL.

Correct Answer
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A sample of 496 g of white phosphorus,P₄,contains the same number of atoms as

Correct Answer
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A 4.94-g sample of an oxide of chromium contains 3.06 g of chromium.Calculate the simplest formula for the compound.

Correct Answer
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Which of the following samples contains the smallest number of molecules?

Correct Answer
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The empirical formula of butadiene is C₂H₃.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

Correct Answer
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Correct Answer
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Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass.What is its empirical formula?

Correct Answer
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How many moles of hexachlorobenzene,C₆Cl₆,are in 5.44 g of C₆Cl₆?

Correct Answer
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The analysis of an organic compound showed that it contained 0.630 mol of C,0.0300 mol of H,0.420 mol of O,and 0.210 mol of N.How many nitrogen atoms are there in the empirical formula for this compound?

Correct Answer
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Complete combustion of a 0.40-mol sample of a hydrocarbon,C_xH_y,gives 2.40 mol of CO₂ and 1.60 mol of H₂O.The molecular formula of the original hydrocarbon is

Correct Answer
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How many moles of silver are contained in 7.00 kg of silver?

Correct Answer
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Consider the following reaction: 2A + B → 3C + D 3) 0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?

Correct Answer
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2KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

Correct Answer
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A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO₂ and H₂O are produced.The hydrocarbon could be

Correct Answer
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A sample of an oxide of antimony (Sb) contained 48.5 g of antimony combined with 15.9 g of oxygen.What is the simplest formula for the oxide?

Correct Answer
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Calculate the number of moles of O₂ required to react with phosphorus to produce 3.56 g of P₄O₆.(Molar mass P₄O₆ = 219.9 g/mol)

Correct Answer
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Which one of the following contains 4.21 × 10²⁴ atoms?

Correct Answer
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A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO₂ and 0.6474 g of H₂O.What is the empirical formula of the compound?

Correct Answer
verified

What is the mass in grams of one propene,C₃H₆,molecule?

Correct Answer
verified

Exam 3: Calculations With Chemical Formulas and Equations

Sorbose,C6H12O6,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

Correct AnswerverifiedShow Answer

Calculate the number of moles of bromine present in 20.5 mL of Br2(l) ,whose density is 3.12 g/mL.

Correct AnswerverifiedShow Answer

A sample of 496 g of white phosphorus,P4,contains the same number of atoms as

Correct AnswerverifiedShow Answer

A 4.94-g sample of an oxide of chromium contains 3.06 g of chromium.Calculate the simplest formula for the compound.

Correct AnswerverifiedShow Answer

Which of the following samples contains the smallest number of molecules?

Correct AnswerverifiedShow Answer

The empirical formula of butadiene is C2H3.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass.What is its empirical formula?

Correct AnswerverifiedShow Answer

How many moles of hexachlorobenzene,C6Cl6,are in 5.44 g of C6Cl6?

Correct AnswerverifiedShow Answer

The analysis of an organic compound showed that it contained 0.630 mol of C,0.0300 mol of H,0.420 mol of O,and 0.210 mol of N.How many nitrogen atoms are there in the empirical formula for this compound?

Correct AnswerverifiedShow Answer

Complete combustion of a 0.40-mol sample of a hydrocarbon,CxHy,gives 2.40 mol of CO2 and 1.60 mol of H2O.The molecular formula of the original hydrocarbon is

Correct AnswerverifiedShow Answer

How many moles of silver are contained in 7.00 kg of silver?

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Consider the following reaction: 2A + B → 3C + D 3) 0 mol A and 2.0 mol B react to form 4.0 mol C.What is the percent yield of this reaction?

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2KHCO3(s) → K2CO3(s) + CO2(g) + H2O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

Correct AnswerverifiedShow Answer

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO2 and H2O are produced.The hydrocarbon could be

Correct AnswerverifiedShow Answer

A sample of an oxide of antimony (Sb) contained 48.5 g of antimony combined with 15.9 g of oxygen.What is the simplest formula for the oxide?

Correct AnswerverifiedShow Answer

Calculate the number of moles of O2 required to react with phosphorus to produce 3.56 g of P4O6.(Molar mass P4O6 = 219.9 g/mol)

Correct AnswerverifiedShow Answer

Which one of the following contains 4.21 × 1024 atoms?

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A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO2 and 0.6474 g of H2O.What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

What is the mass in grams of one propene,C3H6,molecule?

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Sorbose,C₆H₁₂O₆,is used in making vitamin C.A sorbose sample containing 36.0 g of carbon atoms also contains ____ g of hydrogen atoms.

Correct Answer
verified

Calculate the number of moles of bromine present in 20.5 mL of Br₂(l) ,whose density is 3.12 g/mL.

Correct Answer
verified

A sample of 496 g of white phosphorus,P₄,contains the same number of atoms as

Correct Answer
verified

Correct Answer
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Correct Answer
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The empirical formula of butadiene is C₂H₃.An experimental determination of the molar mass of butadiene by a student yields the value of 54 g/mol.What is the molecular formula of butadiene?

Correct Answer
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Correct Answer
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Correct Answer
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How many moles of hexachlorobenzene,C₆Cl₆,are in 5.44 g of C₆Cl₆?

Correct Answer
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Correct Answer
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Complete combustion of a 0.40-mol sample of a hydrocarbon,C_xH_y,gives 2.40 mol of CO₂ and 1.60 mol of H₂O.The molecular formula of the original hydrocarbon is

Correct Answer
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Correct Answer
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Correct Answer
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2KHCO₃(s) → K₂CO₃(s) + CO₂(g) + H₂O(l) How many moles of potassium carbonate will be produced if 487 g of potassium hydrogen carbonate are heated?

Correct Answer
verified

A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water.Equal numbers of moles of CO₂ and H₂O are produced.The hydrocarbon could be

Correct Answer
verified

Correct Answer
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Calculate the number of moles of O₂ required to react with phosphorus to produce 3.56 g of P₄O₆.(Molar mass P₄O₆ = 219.9 g/mol)

Correct Answer
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Which one of the following contains 4.21 × 10²⁴ atoms?

Correct Answer
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A compound containing only carbon,hydrogen,and oxygen is subjected to elemental analysis.Upon complete combustion,a 0.7916-g sample of the compound produced 1.581 g of CO₂ and 0.6474 g of H₂O.What is the empirical formula of the compound?

Correct Answer
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What is the mass in grams of one propene,C₃H₆,molecule?

Correct Answer
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