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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.
Most commonly, the adiabatic combustion temperatures for coals are around 2,200 Â°C (3,992 Â°F) (for inlet air and fuel at ambient temperatures and for Î» = 1.0 {\displaystyle \lambda =1.0} ), around 2,150 Â°C (3,902 Â°F) for oil and 2,000 Â°C (3,632 Â°F) for natural gas.