Percent Composition Definition

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Percent composition is the percentage by mass of each element in a compound.

Example: The percent composition of water is 20% hydrogen and 80% oxygen.

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Helmenstine, Anne Marie, Ph.D. "Percent Composition Definition." ThoughtCo, Aug. 28, 2020, thoughtco.com/definition-of-percent-composition-605490. Helmenstine, Anne Marie, Ph.D. (2020, August 28). Percent Composition Definition. Retrieved from https://www.thoughtco.com/definition-of-percent-composition-605490 Helmenstine, Anne Marie, Ph.D. "Percent Composition Definition." ThoughtCo. https://www.thoughtco.com/definition-of-percent-composition-605490 (accessed April 18, 2021).