# Mass Percent - The Mass Percent of a component is defined...

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The Mass Percent of a component is defined What is the mass percents of carbon, hydrogen, and oxygen in pure ethanol  C 2 H 6 O ? First we calculate the mass of one mole of  C 2 H 6 O ... mass of 2 moles of C is 2 X 12.011 g mass of 6 moles of H is 6 X 1.008 g mass of 1 mole of O is 15.999 g Molecular weight of C 2 H 6 O is 46.069 g Next we calculate the mass percents Note that the mass percentages should add up to 100%. Combustion Analysis When chemists make new compounds one of the first things they often do is determine the mass % for the  different elements in the compound. To analyze the mass percent of carbon and hydrogen chemist use a  combustion device.

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The sample is burned in the presence of excess oxygen which converts all the carbon to carbon dioxide and all  the hydrogen to water. The  CO 2 and  H 2 O
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## This note was uploaded on 10/13/2011 for the course CHEMISTRY 121 taught by Professor Staff during the Fall '10 term at Bangladesh University of Eng and Tech.

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Mass Percent - The Mass Percent of a component is defined...

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