Percent CompositionChemistry

Percent Composition by Mass Elemental Calculator

Calculate the exact mass percentage (% by weight) of any element in a chemical compound from atom count, atomic mass, and total formula molar mass.

Calculated Result

Element Mass Percent (%)

11.19

Calculator Inputs

atoms
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g/mol
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g/mol
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Element Mass Percent (%)

11.19

Element Mass Contribution

2.02 g/mol

Other Elements Combined (%)

88.81 %

Definite Proportions Verification: Accurately reflects elemental contribution in a stoichiometrically pure compound.

Elemental Mass Share in Compound

Element %
11.19 %(11%)
Remainder %
88.81 %(89%)

Standard stoichiometry and mineral chemistry tool for elemental mass fraction analysis.

Calculation Methodology

Element Percent Composition = [ (Number of Atoms * Atomic Weight) / Total Compound Molar Mass ] * 100%.

Frequently Asked Questions

Commercial fertilizer numbers (e.g., 20-10-10) directly state the percent composition by weight of elemental nitrogen, phosphate (P2O5), and potash (K2O).

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