Elemental Composition
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4 Terms
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Percent composition
% by mass of each element in a compound
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How percent composition is found
From chemical formula or experimental data
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Formula for percent composition
% element = (total mass of element in compound / molar mass of compound) × 100%
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Percent composition of H2O
% H = (2×1.008 / 18.02) × 100 ≈ 11.2%
% O = (16.00 / 18.02) × 100 ≈ 88.8%
Note 
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