Asked by Matilda
                Hi, I am doing a practice test for my chemistry final and I do not understand one of the answer they gave for this thermochemical equation question. I do not understand how they got 400kJ.
The question is: Butane has a deltaH of -2871 kJ/mol when it undergoes complete combustion into carbon dioxide and liquid water. Given the following deltaHf values:
Carbon dioxide = -393.5kJ/mol
Oxygen gas = 0kJ/mol
liquid water = -285.8 kJ/mol
a) write the balanced thermochemical equation for the complete combustion of 1 mol of butane.
The answer given is: C4H10 =6.5O2 ---> 4Co2 + 5H20 + 400kJ.
I just don't understand how they calculated the kJ to be 400. Any help is greatly appreciated.
            
        The question is: Butane has a deltaH of -2871 kJ/mol when it undergoes complete combustion into carbon dioxide and liquid water. Given the following deltaHf values:
Carbon dioxide = -393.5kJ/mol
Oxygen gas = 0kJ/mol
liquid water = -285.8 kJ/mol
a) write the balanced thermochemical equation for the complete combustion of 1 mol of butane.
The answer given is: C4H10 =6.5O2 ---> 4Co2 + 5H20 + 400kJ.
I just don't understand how they calculated the kJ to be 400. Any help is greatly appreciated.
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