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Percent composition is usually expressed as a percent by mass, but in the case of gases and vapors, it is often expressed as a percent by volume.

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βˆ™ 14y ago
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βˆ™ 6mo ago

mass. It represents the proportion of each element in a compound by mass, calculated by dividing the mass of each element by the total mass of the compound and multiplying by 100.

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Q: Percent composition is expressed as a percent by?
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