% composition=mass of element/mass of compound x 100%
Emample
1.Find the percentage composition of a compound that contains 1.94g of carbon, 0.48g of hydrogen and 2.58g of sulfur in a 5.00g sample of the compound.
%C=1.94g/5.00g x 100%=38.8%
% H=2.58g/5.00g x 100%=51.6%
2. An unknown compound with a mass of 34.5 grams contains 4.5g of hydrogen, 18g of oxygen and 12g of nitrogen. What is percent composition of compound?
%H=4.5g/34.5g x 100%=13.0%
%O=18g/34.5g x 100%=52.1%
%N=12g/34.5g x 100%=134.8%
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