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Old 05-04-2008, 10:41 AM   #154
nominal
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this may be simple, but

this 2004 ap free response question, number 2:

A) determine the empirical formula of a hydrocarbon that contains 85.7% carbon by mass.

I can't figure this out, i know how to get to the answer, Carbon/(Carbon + Hydrogen) x 100...but I can't get 85.7% exact. And i think empirical means it has to be in it's lowest form or something.

can anyone help me out?
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