Percentage Composition

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Presentation transcript:

Percentage Composition

Percent Part X 100% Whole Percent by mass = Mass of element X 100% Mass of compound

Percent Composition of H2O 2 H’s = 2 (1g) = 2g 1 O = 1 (16g) = 16g ______ 18g/mole (molar mass)

Percent Composition % H = 2g x 100% = 11.11% 18g % O = 16.0g x 100% = 88.89% 18.0g _______ 100.00%

Percent Composition of C6H12O6 6 C = 6 (12g) = 72g 12 H = 12 (1g) = 12g 6 O = 6 (16g) = 96g ______ 180g/mole

% C = % H = % O = 72g x 100% = 40.00% 180g 12g x 100% = 6.67% 180g 96g X 100% = 53.33% 180g _______ 100.00%

Percentage Composition Sum of individual element %’s must add up to exactly 100% usually works out exact if round to 2 decimal places