Question 1

How many grams are present in 0.885 moles of manganese?

Accepted Answer

A)  62.1 g
B)  48.6 g
C)  21.5 g
D)  27.5 g
E)  0.016 gF) A) and D)
G) B) and E)

Question 2

What is the molecular mass of acetaminophen, C8H9NO2?

Accepted Answer

A)  43 amu
B)  76 amu
C)  151 amu
D)  162 amu
E)  125 amuF) A) and D)
G) B) and E)

Question 3

Which of the following is an empirical formula of a compound that is 52.15 percent C, 13.13 percent H, and 34.73 percent O?

Accepted Answer

A)  C4H12O2
B)  CH6O2
C)  C3HO6
D)  C2H6O
E)  None of the answers is correct.F) A) and C)
G) A) and E)

Question 4

How many moles of aspirin, C9H8O4, are in a tablet that contains 325 mg of aspirin?

Accepted Answer

A)  0.00180 moles
B)  0.555 moles
C)  0.467 moles
D)  0.357 moles
E)  2.80 molesF) A) and D)
G) C) and E)

Question 5

How many grams are contained in a 0.183 mol sample of ammonium phosphate?

Accepted Answer

A)  1.23 × 10−3 g
B)  617 g
C)  20.7 g
D)  27.3 g
E)  815.1 gF) A) and B)
G) C) and D)

Question 6

What is the molar mass of nicotine, C10H14N2?

Accepted Answer

A)  134 g/mol
B)  148 g/mol
C)  158 g/mol
D)  210 g/mol
E)  162 g/molF) D) and E)
G) A) and E)

Question 7

Determine the number of oxygen atoms contained in 29.7 grams of Al2(CO3) 3.

Accepted Answer

A)  6.88 × 1023 O atoms
B)  7.64 × 1022 O atoms
C)  1.27 × 1022 O atoms
D)  9.44 × 1023 O atoms
E)  4.37 × 1023 O atomsF) C) and D)
G) B) and D)

Question 8

What is the mass, in grams, of one arsenic atom? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  5.48× 10−23 g
B)  33.0 g
C)  74.9 g
D)  1.24 × 10−22 g
E)  8.04 × 1021 gF) None of the above
G) A) and D) D

Question 9

Determine the number of ammonia molecules in 4.85 g of ammonia.(NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  2.92 × 1023 molecules
B)  4.73 × 10−25 molecules
C)  1.24 × 1023 molecules
D)  5.83 × 10−24 molecules
E)  1.71 × 1023 moleculesF) A) and B)
G) None of the above

Question 10

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

Question 11

What is the mass of 1.63 × 1021 atoms of silicon? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  2.71× 10−23 g
B)  4.58 × 1022 g
C)  28.08 g
D)  1.04 × 104 g
E)  7.60 × 10−2 gF) A) and B)
G) A) and C)

Question 12

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) C) and E)
G) B) and D)

Question 13

Determine the mass of Al(C2H3O2) 3 that contains 2.63 Χ 1024 atoms of oxygen.

Accepted Answer

A)  652 g
B)  891 g
C)  149 g
D)  89.5 g
E)  26.2 gF) C) and E)
G) B) and D)

Question 14

What is the mass of 1.21 × 1020 atoms of sulfur? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  3.88 × 1021 g
B)  2.0 mg
C)  32.06 g
D)  6.44 mg
E)  2.00 × 10−4 gF) B) and C)
G) A) and E)

Question 15

Calcium fluoride, CaF2, is a source of fluorine and is used to fluoridate drinking water.Calculate its formula mass.

Accepted Answer

A)  118.15 g/mol
B)  99.15 g/mol
C)  78.08 g/mol
D)  59.08 g/mol
E)  50.01 g/molF) C) and E)
G) A) and C)

Question 16

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Accepted Answer

A)  2.377 mol
B)  2.146 mol
C)  1.105 mol
D)  0.4660 mol
E)  0.4207 molF) C) and E)
G) B) and E)

Question 17

How many atoms are in 0.534 mol of nickel, Ni?

Accepted Answer

A)  1.13 × 1024 atoms
B)  1.48 × 1025 atoms
C)  2.44 × 1022 atoms
D)  3.22 × 1023 atoms
E)  6.98 × 1021 atomsF) B) and D)
G) C) and D)

Question 18

A rock contains an element with a molar mass of 40.08 g/mol.If 9.28 × 1024 atoms of this element were found in the rock, how many grams of the unknown element are present in the rock?

Accepted Answer

A)  618 g
B)  1.49 × 1028 g
C)  2.24 × 1050 g
D)  0.38 g
E)  3.80 gF) B) and E)
G) B) and D) A

Question 19

What is the percent sulfur in iron(III)  sulfate?

Accepted Answer

A)  28%
B)  32%
C)  24%
D)  48%
E)  42%F) All of the above
G) A) and C)

Question 20

Which of the following is a molecular formula for a compound with an empirical formula of CH?

Accepted Answer

A)  C2H6
B)  C3H9
C)  C4H10
D)  C6H6
E)  None of the answers is correct.F) A) and B)
G) A) and C)

Exam 5: The Mole and Chemical Formulas

How many grams are present in 0.885 moles of manganese?

Correct AnswerverifiedShow Answer

What is the molecular mass of acetaminophen, C8H9NO2?

Correct AnswerverifiedShow Answer

Which of the following is an empirical formula of a compound that is 52.15 percent C, 13.13 percent H, and 34.73 percent O?

Correct AnswerverifiedShow Answer

How many moles of aspirin, C9H8O4, are in a tablet that contains 325 mg of aspirin?

Correct AnswerverifiedShow Answer

How many grams are contained in a 0.183 mol sample of ammonium phosphate?

Correct AnswerverifiedShow Answer

What is the molar mass of nicotine, C10H14N2?

Correct AnswerverifiedShow Answer

Determine the number of oxygen atoms contained in 29.7 grams of Al2(CO3) 3.

Correct AnswerverifiedShow Answer

What is the mass, in grams, of one arsenic atom? (NA = 6.022 × 1023 mol−1)

Correct AnswerverifiedD

Determine the number of ammonia molecules in 4.85 g of ammonia.(NA = 6.022 × 1023 mol−1)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

What is the mass of 1.63 × 1021 atoms of silicon? (NA = 6.022 × 1023 mol−1)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Determine the mass of Al(C2H3O2) 3 that contains 2.63 Χ 1024 atoms of oxygen.

Correct AnswerverifiedShow Answer

What is the mass of 1.21 × 1020 atoms of sulfur? (NA = 6.022 × 1023 mol−1)

Correct AnswerverifiedShow Answer

Calcium fluoride, CaF2, is a source of fluorine and is used to fluoridate drinking water.Calculate its formula mass.

Correct AnswerverifiedShow Answer

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al2O3.

Correct AnswerverifiedShow Answer

How many atoms are in 0.534 mol of nickel, Ni?

Correct AnswerverifiedShow Answer

A rock contains an element with a molar mass of 40.08 g/mol.If 9.28 × 1024 atoms of this element were found in the rock, how many grams of the unknown element are present in the rock?

Correct AnswerverifiedA

What is the percent sulfur in iron(III) sulfate?

Correct AnswerverifiedShow Answer

Which of the following is a molecular formula for a compound with an empirical formula of CH?

Correct AnswerverifiedShow Answer

Correct Answer
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What is the molecular mass of acetaminophen, C₈H₉NO₂?

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How many moles of aspirin, C₉H₈O₄, are in a tablet that contains 325 mg of aspirin?

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What is the molar mass of nicotine, C₁₀H₁₄N₂?

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Determine the number of oxygen atoms contained in 29.7 grams of Al₂(CO₃) ₃.

Correct Answer
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What is the mass, in grams, of one arsenic atom? (N_A = 6.022 × 10²³ mol⁻¹)

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D

Determine the number of ammonia molecules in 4.85 g of ammonia.(N_A = 6.022 × 10²³ mol⁻¹)

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

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B

What is the mass of 1.63 × 10²¹ atoms of silicon? (N_A = 6.022 × 10²³ mol⁻¹)

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

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Determine the mass of Al(C₂H₃O₂) ₃ that contains 2.63 Χ 10²⁴ atoms of oxygen.

Correct Answer
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What is the mass of 1.21 × 10²⁰ atoms of sulfur? (N_A = 6.022 × 10²³ mol⁻¹)

Correct Answer
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Calcium fluoride, CaF₂, is a source of fluorine and is used to fluoridate drinking water.Calculate its formula mass.

Correct Answer
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Aluminum oxide, Al₂O₃, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators.Calculate the number of moles in 47.51 g of Al₂O₃.

Correct Answer
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Correct Answer
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A rock contains an element with a molar mass of 40.08 g/mol.If 9.28 × 10²⁴ atoms of this element were found in the rock, how many grams of the unknown element are present in the rock?

Correct Answer
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A

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