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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.
Formula Online thermodynamics calculator to calculate radiant heat energy of perfect black body using Stefan's law based on absolute temperature (T). Calculate Radiant Heat Energy using Stefan's Law Absolute Temperature (T)