Posted by HELP on Sunday, April 10, 2011 at 11:08pm.
C2H2 +5/2 O2 ==> 2CO2 + H2O
I would look up the deltaHf for CO2 and for H2O as well as C2H2. Then
delta Hrxn = (n*DHfCO2)+(n*DHfH2O) - (n*DHfC2H2)
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