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
Quick select:
g/mol
Quick select:
g/mol
Quick select:
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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