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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.
The temperature of an elementburned when the mass fraction burned was ex' is (4.34) The temperature of the element immediately following combustion, T (ex', ex'),may be evaluated by applying the first law ofthennodynamics to the combustion of aninfinitesimal mass of charge, dm.