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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 Standard Enthalpy (Heat) of Reaction, Î´H o, is the difference between the standard enthalpies (heats) of formation of the products and the reactants. 2  Î´H o (reaction) = the sum of the enthalpy (heat) of formation of products-the sum of the enthalpy (heat) of formation of reactants: