Question 1

Determine the mass of hydrogen (in grams)  that contains 5.08 × 1015 hydrogen atoms.

Accepted Answer

A)  5.12 × 1015 g
B)  3.06 × 1039 g
C)  3.06 × 10−9 g
D)  8.50 × 10−9 g
E)  8.5 × 1015 g

Question 2

Household sugar, sucrose, has the molecular formula C12H22O11.What is the % of carbon in sucrose, by mass?

Accepted Answer

A)  26.7%
B)  33.3%
C)  41.4%
D)  42.1%
E)  51.4%

Question 3

Calculate the mass of 3.00 moles of CF2Cl2.

Accepted Answer

A)  3.00 g
B)  174 g
C)  363 g
D)  1.81 × 1024 g
E)  40.3

Question 4

Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

Accepted Answer

A)  6.06 × 10−4 g
B)  2.91 × 10−2 g
C)  4.85 × 10−2 g
D)  20.6 g
E)  1650 g

Question 5

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

Accepted Answer

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

Question 6

Which of the following is the empirical formula for hexane, C6H14?

Accepted Answer

A)  C12H28
B)  C6H14
C)  C3H7
D)  CH2.3
E)  C0.43H

Question 7

What is the mass of 7.80 × 1018 carbon atoms? (NA = 6.022 × 1023 mol−1)

Accepted Answer

A)  1.30 × 10−5 g
B)  6.43 × 103 g
C)  7.80 × 1018 g
D)  1.56 × 10−4 g
E)  12.01 g

Question 8

Calculate the formula mass of (NH4) 3AsO4.

Accepted Answer

A)  417.80 amu
B)  193.05 amu
C)  165.02 amu
D)  156.96 amu
E)  108.96 amu

Question 9

Which of the following is a molecular formula for a compound with an empirical formula of CH2O and a molar mass of 150.g/mol?

Accepted Answer

A)  C7H18O3
B)  C5H10O5
C)  C3H6O3
D)  CH2O
E)  None of the answers is correct.

Question 10

Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

Accepted Answer

A)  1.8 × 104 g
B)  1.3 × 107 g
C)  1.8 × 102 g
D)  2.8 × 1029 g
E)  None of the answers is correct.

Question 11

Which of the following substances contains the greatest mass of carbon?

Accepted Answer

A)  100 g CH4
B)  100 g C2H4
C)  100 g CCl4
D)  100 g CH2Cl2
E)  100 g CO2

Question 12

What is the percent sodium in sodium carbonate?

Accepted Answer

A)  43.4%
B)  11.3%
C)  45.3%
D)  27.7%
E)  21.7%

Question 13

How many atoms are in 7.12 mol of gold, Au?

Accepted Answer

A)  1.18 × 10−23 atoms
B)  4.29 × 1024 atoms
C)  8.46 × 1022 atoms
D)  4.70 × 1024 atoms
E)  3.34 × 1026 atoms

Question 14

What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

Accepted Answer

A)  4.0 × 102 g
B)  25.0 g
C)  17.0 g
D)  4.00 × 10−2 g
E)  2.50 × 10−3 g

Question 15

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 16

Determine the empirical formula of a compound that contains 1.409 moles of P and 3.52 moles of O in a particular sample.

Accepted Answer

A)  PO2
B)  PO3
C)  P2O6
D)  P2O5
E)  P2O3

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 moles

Question 18

Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

Accepted Answer

A)  5.38 mol
B)  3.55 mol
C)  0.583 mol
D)  0.282 mol
E)  0.186 mol

Question 19

Determine the mass of Sr(C2H3O2) 2 that contains 2.780 Χ 1023 atoms of carbon.

Accepted Answer

A)  205.7 g
B)  57.19 g
C)  46.16 g
D)  94.96 g
E)  23.74 g

Question 20

What is the mass of 0.0250 mol of P2O5?

Accepted Answer

A)  35.5 g
B)  5676 g
C)  0.0250 g
D)  1.51 × 1022 g
E)  3.55 g

Exam 5: The Mole and Chemical Formulas

Determine the empirical formula of a compound that contains 1.409 moles of P and 3.52 moles of O in a particular sample.

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What is the percent sodium in sodium carbonate?

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How many atoms are in 7.12 mol of gold, Au?

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Household sugar, sucrose, has the molecular formula C12H22O11.What is the % of carbon in sucrose, by mass?

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Phosphorus pentachloride, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions.Calculate the number of moles in 38.7 g of phosphorus pentachloride.

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Determine the mass of hydrogen (in grams) that contains 5.08 × 1015 hydrogen atoms.

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How many moles are present in 17.4 g of lead?

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What is the mass percent of oxygen in barium perchlorate?

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Smooth muscle myosin is a motor protein that plays a crucial role in the contraction of smooth muscle.If this protein has a molar mass of 480,000 grams/mol, what is the mass, in grams, of 27 moles of smooth muscle myosin?

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Which of the following is the empirical formula for hexane, C6H14?

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Calculate the formula mass of (NH4) 3AsO4.

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What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

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

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Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 1020 molecules of sulfur trioxide.

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Which of the following substances contains the greatest mass of carbon?

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What is the mass of 0.0250 mol of P2O5?

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What is the mass of 7.80 × 1018 carbon atoms? (NA = 6.022 × 1023 mol−1)

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Which of the following is a molecular formula for a compound with an empirical formula of CH2O and a molar mass of 150.g/mol?

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Determine the mass of Sr(C2H3O2) 2 that contains 2.780 Χ 1023 atoms of carbon.

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Calculate the mass of 3.00 moles of CF2Cl2.

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Household sugar, sucrose, has the molecular formula C₁₂H₂₂O₁₁.What is the % of carbon in sucrose, by mass?

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Determine the mass of hydrogen (in grams) that contains 5.08 × 10¹⁵ hydrogen atoms.

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Which of the following is the empirical formula for hexane, C₆H₁₄?

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Calculate the formula mass of (NH₄) ₃AsO₄.

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

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Sulfur trioxide can react with atmospheric water vapor to form sulfuric acid that falls as acid rain.Calculate the mass in grams of 3.65 × 10²⁰ molecules of sulfur trioxide.

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What is the mass of 0.0250 mol of P₂O₅?

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What is the mass of 7.80 × 10¹⁸ carbon atoms? (N_A = 6.022 × 10²³ mol⁻¹)

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Which of the following is a molecular formula for a compound with an empirical formula of CH₂O and a molar mass of 150.g/mol?

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Determine the mass of Sr(C₂H₃O₂) ₂ that contains 2.780 Χ 10²³ atoms of carbon.

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Calculate the mass of 3.00 moles of CF₂Cl₂.

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