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# 3-C-1 - Percentage Composition Percent Composition...

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1 Percent Composition: Identifies the elements present in a compound as a mass percent of the total compound mass. The mass percent is obtained by dividing the mass of each element by the total mass of a compound and converting to percentage. Percentage Composition

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2 Empirical Formula The empirical formula gives the ratio of the number of atoms of each element in a compound. Compound Formula Empirical Formula Hydrogen peroxide H 2 O 2 OH Benzene C 6 H 6 CH Ethylene C 2 H 4 CH 2 Propane C 3 H 8 C 3 H 8
3 Percentage Composition Glucose has the molecular formula C 6 H 12 O 6 . What is its empirical formula, and what is the percentage composition of glucose? Empirical Formula = smallest whole number ratio CH 2 O

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4 Percentage Composition CH 2 O Total mass = 12.01 + 2.02 + 16.00 = 30.03 %C = 12.01/30.03 x 100% = 39.99% %H = 2.02/30.03 x 100% = 6.73% %O = 16.00/30.03 x 100% = 53.28%
Percentage Composition Saccharin has the molecular formula C 7 H 5 NO 3 S. What is its empirical formula, and what is the percentage composition of saccharin? Empirical Formula is same as molecular formula

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3-C-1 - Percentage Composition Percent Composition...

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