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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.
Combustion Reaction Examples. Examples of combustion reactions include: 2 H2 + O2 â 2H2O + heat. CH4 + 2 O2 â CO2 + 2 H2O + heat. Other examples include lighting a match or a burning campfire. To recognize a combustion reaction, look for oxygen in the reactant side of the equation and the release of heat on the product side. Because it isn't a chemical product, heat isn't always shown.