Chemistry
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a 143.1 g sample of a compound contains 53.4 g of carbon, 16.9 g of hydrogen, 43 g of nitrogen, and some amount of oxygen. what is the mass percent of oxygen in the compound?

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(1) Answers
KeriDrungo387

mass of oxygen = 143,1g - (53,4g + 16,9g + 43g) = 29,8g If 143,1g ------ is ------ 100%                        so    29,8g  ------- is ------ %O %O = (29,8g*100%) / 143,1g = 20,82%

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