How does the Percent Composition work?

Calculate the molar mass of the compound Then: For each element: element mass in formula = atomic mass × subscript Then: Percent composition = (element mass / total molar mass) × 100%.

Can you give an example of how to use the Percent Composition?

Example: Input H₂O: H=2×1.008=2.016, O=15.999, total=18.015 gives a result of H: 11.2%, O: 88.8% (2.016/18.015×100=11.19%).

Is the Percent Composition free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Percent Composition?

Our Percent Composition uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Percent Composition

⚗️Percent Composition Calculator

Chemical formula

e.g. H2O, NaCl, C6H12O6

Percent composition by mass expresses the percentage of each element in a compound relative to the compound's total molar mass. It is used to confirm compound identity and to calculate empirical formulas.

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Did You Know?

Iron ore (Fe₂O₃) contains 69.9% iron by mass. A 1-tonne charge of ore yields only 699 kg of iron before further refining — economic knowledge of stoichiometry has massive industrial significance.

References

›Mass fraction — Wikipedia

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Percent Composition

⚗️Percent Composition Calculator

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