Chemistry Flashcard: Percent Composition by Mass

Front

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 by mass of an element in a compound?

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To calculate percent composition by mass, use the formula: \( \text{Percent Composition} = \left( \frac{\text{mass of element}}{\text{total mass of compound}} \right) \times 100 \)

Front

What is the molar mass of water (H2O)?

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The molar mass of water (H2O) is approximately 18.02 g/mol.

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

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The percent composition by mass of hydrogen in water is approximately 11.2%.

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What is the molar mass of iron (Fe) in FeCl3?

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The molar mass of iron (Fe) in FeCl3 is approximately 55.85 g/mol.

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What is the percent by mass of Fe in FeCl3?

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The percent by mass of Fe in FeCl3 is approximately 34.43%.

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

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The molar mass of carbon dioxide (CO2) is approximately 44.01 g/mol.

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

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The percent composition by mass of carbon in carbon dioxide is approximately 27.3%.

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What is the molar mass of carbon monoxide (CO)?

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The molar mass of carbon monoxide (CO) is approximately 28.01 g/mol.

Front

In carbon monoxide (CO), which element has a higher percent composition by mass?

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Oxygen has a higher percent composition by mass in carbon monoxide.