Help difficult chemistry question?

Posted on 2016-05-04 18:34:00 in Chemistry by JOS

Calculate the enthalpy change of the reaction below by two different methods. 
C3H8(g) + 5O2(g) ------> 3CO2(g) + 4H2O(g) 

a) Use the standard enthalpies of formation: 
C3H8(g)- 104kJ mol -1 
CO2(g)- 394 kJ mol-1 
H2O(g)- 242kJ mol-1 

b) Use the following mean bond enthalpies quoted in kJmol-1. 
C-C 348, C-H 412, O=O 496, C=O 804 and O-H 463 

c)Account for any difference between the two values.

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