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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 /kÉmËbÊs.tÊÉn/ or burning is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.he general reaction equation for incomplete combustion of one mole of a hydrocarbon in oxygen is: The simple word equation for the incomplete combustion of a hydrocarbon in oxygen is: For stoichiometric (complete) combustion, z = x + Â¼ y.