Percent Composition Calculator

Calculate Percent Composition

About Percent Composition

Percent composition is the percentage by mass of each element in a compound. It's calculated by dividing the mass of each element by the total mass of the compound.

% Element = (Mass of Element / Total Mass) × 100

Applications:

  • Determining empirical and molecular formulas
  • Quality control in manufacturing
  • Nutritional analysis
  • Environmental monitoring

Example - Water (H₂O):

% H = (2 × 1.008) / 18.015 × 100 = 11.19%
% O = (1 × 15.999) / 18.015 × 100 = 88.81%

Percent composition is fundamental in analytical chemistry, materials science, and chemical analysis.

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