Homework Help: chemistry

Posted by Anonymous on Thursday, February 14, 2013 at 11:01am.

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 - Steve, Thursday, February 14, 2013 at 11:21am
230-(136.6+26.4+31.8) = 35.2

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

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