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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.
When properly combusted, propane produces about 50 MJ/kg of heat. The gross heat of combustion of one normal cubic meter of propane is around 91 megajoules. Propane combustion is much cleaner than gasoline combustion, though not as clean as natural gas combustion.