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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.
The heat of combustion can be most conveniently measured using an adiabatic bomb calorimeter. In. such calorimeter, the combustion reaction occurs in a closed container under constant volume (âbombâ). The bomb. is immersed in a weighted quantity of water and surrounded by an adiabatic shield that serves as a heat insulator.