Another way to use a chemical formula is to determine the percent composition of each element in a substance. Percent co

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Another Way To Use A Chemical Formula Is To Determine The Percent Composition Of Each Element In A Substance Percent Co 1 (52.74 KiB) Viewed 66 times

Another way to use a chemical formula is to determine the percent composition of each element in a substance. Percent composition is based on mass, so we also refer to this as the mass percent of each element, or the percent composition by mass. number of atoms of element ¹5) (₁ atomic weight of element % mass composition of element: x 100% formula weight of substance Example: What is the mass percent of oxygen in carbon dioxide? The chemical formula CO₂, tells us the ratio of C to O in terms of number of atoms. We can use the atomic weight of each substance to convert that to a mass ratio. Molar mass of CO₂ = 1(molar mass of C) + 2(molar mass of O) = 1(12.011 g/mol) + 2(15.999 g/mol) = 44.009 g/mol Mass of O in CO₂ = 2(molar mass of O) = 2(15.999 g/mol) =31.998 g/mol Mass percent O= [ (31.998 g/mol) / (44.009 g/mol) ] *100% = 72.708 % oxygen by mass 1) What is the mass percent of hydrogen in H₂O? Report your answer with 4 significant digits. 2) What is the mass percent of carbon in CH4? Report your answer with 4 significant digits. 3) What is the mass percent of Cl in CCl4? Report your answer with 4 significant digits.. %