Delta H of combustion

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204301116
Posts: 16
Joined: Fri Sep 26, 2014 2:02 pm

Delta H of combustion

Postby 204301116 » Thu Mar 12, 2015 2:52 pm

Can someone please explain this to me? I understand that for methane the coefficient of CO2 is 1 and for ethanol liquid and octane it is 2, but how did they get the answer for octane? Thanks
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Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

Re: Delta H of combustion

Postby Niharika Reddy 1D » Thu Mar 12, 2015 5:54 pm

If you balance the reaction for the combustion of 1 mol octane, you will get 8 mol CO2. Dividing ΔHc° of octane by 8 mol CO2 yields -684 kJ/mol CO2.


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