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So O2 has zero of heat of formation (or enthalpy of formation). The enthalpy of a reaction is defined like this: H = Hproducts-H reactants. The enthalpy of reaction in this case, is the same as the heat of combustion. Hproducts is obtained summing the heats of formation.
1 Heats of combustion are typically stated in kilojoules per mole (kJ/mol. or kJ mol. ). 2  The accepted value for the molar heat of combustion of ethanol is 1360 kJ mol. . 3  The following steps allow the calculation of an experimental value for the molar heat of combustion of ethanol: