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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.
Measuring Heat of Combustion (Measuring Enthalpy of Combustion) 1  A known quantity of water is placed in a flask, beaker or can. 2  A thermometer is positioned with bulb near the middle of the volume of water. 3  A known quantity of fuel, such as an alcohol (alkanol), is placed in the spirit burner.