CHEM HELP!? need urgent!!

Posted on 2016-03-28 18:50:00 in Chemistry by ANNY

How much of excess reagent is remaining when 2.79 mol of C2H4 reacts with 3.10 mol of O2? What is the maximum number of water molecules produced in the above reaction? I tried it but I did not get anything right :/ 

The way I did the equation was 
C2H4+O2-->CO+H2O, but I was told the equation is supposed to be C2H4 + O2 --> CO2+H2O before it is balanced and after balanced 
C2H4 + 3O2 --> 2CO2+2H2O 

I understand how to balance it I just don't understand why C2H4 + O2 --> CO2 instead of just CO?

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