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= 1211 kJ mol-1. Therefore the molar heat of combustion of ethanol is 1211 kJ mol-1 (The molar enthalpy of combustion of ethanol is 1211 kJ mol-1). (Note that the enthalpy change for the reaction is negative because the reaction is exothermic, so the enthalpy change for the reaction is -1211 kJ mol-1, ÎH = - 1211 kJ mol-1)
Well, I think you got tricked into thinking that you needed that equation to answer the question. What you really need is to look in the data book for the heat of combustion for which it will state it is -286kJ/mol. as, the energy density will be 143kJ/g.