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chemistry

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A 230 g sample of a compound contains 136.6 g of carbon, 26.4 g of hydrogen, and 31.8 g of nitrogen. The rest is oxygen. What is the mass percent of oxygen in the compound?

  • chemistry -

    230-(136.6+26.4+31.8) = 35.2

    So, oxygen = 35.2/230 = .153 = 15.3%

  • chemistry -

    What is the empirical formula of a phosphoric acid that contains 0.3086 g of hydrogen, 3.161 g of phosphorus, and 6.531 g of oxygen?

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