If the energy given out is bigger then the energy put in, it's exothermic, if the energy put in is bigger then the energy given out, it;s endothermic.
q=mc(delta)T
q is the heat/enegry given out in joules.
m is the mass of the substance heated.
delta T is the rise in temperature in celcious or kelvin.
c is the specific heat capacity, usually 4.18 J/g/k
To get from equation to answer in KJmol-1, there are 3 basic steps:
1) Calculate Q from the info given, using q=mc(delta)T
2)Calculate moles of fuel from the mass of fuel burnt.
3) Divide 'q' by the moles to get the answer in joules, and then divide this by 1000 to get the answer in kJ
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