Chemistry Flashcard: Percent Composition by Mass

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What is percent composition by mass?

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Percent composition by mass is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100.

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How do you calculate the percent composition of an element in a compound?

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To calculate the percent composition of an element in a compound, use the formula: \( \text{Percent Composition} = \left( \frac{\text{Mass of Element}}{\text{Total Mass of Compound}} \right) \times 100 \)

Front

What is the percent composition by mass of hydrogen in H2O?

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11.2%

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What is the percent composition of oxygen in carbon dioxide (CO2)?

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72.7%

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What is the percent composition by mass of carbon in carbon dioxide (CO2)?

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27.3%

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What is the percent composition of nitrogen in ammonium nitrate (NH4NO3)?

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35.0%

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What is the percent composition of carbon and hydrogen in benzene (C6H6)?

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C = 92.2%, H = 7.8%

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What is the molar mass of water (H2O)?

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The molar mass of water is approximately 18.02 g/mol.

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What is the molar mass of carbon dioxide (CO2)?

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The molar mass of carbon dioxide is approximately 44.01 g/mol.

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What is the molar mass of ammonium nitrate (NH4NO3)?

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The molar mass of ammonium nitrate is approximately 80.04 g/mol.