Rubbing alcohol contains 60.0%c, 13.4%h, and 26.6%o. what is the molecular formula of rubbing alcohol if its molecular mass is 60.11g/mol?

 So rubbing alcohol contains 60 % carbon, 13.4 % hydrogen and 26.6 % oxygen, the difference. 

Now we have to convert % to atoms ( or mole) To do this we divide by the relative atomic mass. 

C = 60/12 = 5 

H = 13.4/1 = 13.4 

O = 26.6/16 = 1.66 

This is your empirical formula. However it doesn't really make sense having decimal points. 

So divide by 1.66 

C = 5/1.66 = 3.01 

H = 13.4/ 1.66 = 8.07 

O = 1.66/1.66 = 1 

This makes more sense. C3H8O, the empirical formula.

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