Chemistry - Finding molecular formula for dieldrin?

Posted on 2016-04-14 18:29:00 in Chemistry by HELEN

Dieldrin is composed of carbon, hydrogen, oxygen, and chlorine. A 2.416 g sample of dieldrin is subjected to combustion analysis, yielding 3.350 g CO2 and 0.458 g H2O. Mass spectrometry gives a molecular weight of 381 g mol-1. From a separate experiment, it is found that there are 2:1 ratio of C:Cl atoms. Based on this information, what is the molecular formula of dieldrin? 

So I find the mass of carbon in CO2 and oxygen in H2O and then find their moles which I get 0.07612 for C and 0.05084 for H. But how would I find the mass of the oxygen if I don't know the mass of the chlorine? Do I just divide the mole of C by 2 and use the g/mol of Cl to find the mass of Cl? Any help would be greatly appreciated.

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