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Chemistry in Quantitative LanguageFundamentals of General Chemistry Calculations$
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Christopher O. Oriakhi

Print publication date: 2009

Print ISBN-13: 9780195367997

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195367997.001.0001

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Formulas of Compounds and Percent Composition

Formulas of Compounds and Percent Composition

6 (p.53) Formulas of Compounds and Percent Composition
Chemistry in Quantitative Language

Christopher O. Oriakhi

Oxford University Press

Percent means “parts per 100” or “part divided by whole, multiplied by 100.” If the formula of a compound is known, one can easily calculate the mass percent of each element in the compound. By definition, the percent composition of a compound is the mass percent of each element in the compound. The molar mass represents 100% of the compound. % Element = Mass of element/Formula mass ×100 The following steps are helpful in calculating the percent composition if the formula of the compound is known. 1. Calculate the formula mass or molar mass of the compound 2. Calculate the percent composition by dividing the total mass of each element in the formula unit by the molar mass and multiplying by 100. Aspirin, which is commonly used as a pain reliever, has the chemical composition C9H8O4. Calculate the percent composition of aspirin.

Keywords:   combustion analysisa, empirical formula

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