Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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What
information is needed to calculate the percent composition of a compound? a. | the weight of
the sample to be analyzed and its density | b. | the weight of the sample to be analyzed and its molar
volume | c. | the formula of the compound and the atomic mass of its
elements | d. | the formula of the compound and its
density | | |
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2.
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If
60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent
composition of Hg in the compound? a. | 28.5% | c. | 71.5% | b. | 39.9% | d. | 60.1% | | | | |
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3.
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What
is the percent composition of chromium in BaCrO ? a. | 4.87% | c. | 20.5% | b. | 9.47% | d. | 25.2% | | | | |
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4.
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If
20.0 grams of Ca combines completely with 16.0 grams of S to form a compound, what is the percent
composition of Ca in the compound? a. | 1.25% | c. | 44.4% | b. | 20.0% | d. | 55.6% | | | | |
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5.
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What
is the percent composition of carbon, in heptane, C H ?
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6.
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What
is the percent by mass of carbon in acetone, C H O? a. | 20.7% | c. | 1.61% | b. | 62.1% | d. | 30.0% | | | | |
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7.
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Which
expression represents the percent by mass of nitrogen in
NH4NO3?
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8.
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Which
of the following compounds has the lowest percent gold content by weight? a. | AuOH | c. | AuCl | b. | Au(OH) | d. | AuI | | | | |
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9.
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Which
of the following compounds has the highest oxygen content, by weight?
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Short Answer
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10.
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What
is the percent composition of NiO, if a sample of NiO with a mass of 41.9 g contains 33.1 g Ni and
8.8 g O?
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11.
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What
is the percent by mass of hydrogen in aspirin, C H O ?
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