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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.
Quick Answer. The chemical equation for the combustion of hydrogen is 2H2 + O2 â 2H2O. During hydrogen combustion, the heat from burning makes hydrogen chemically react with oxygen gas, O2, in the air to form water. Continue Reading.