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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 generic algebraic equation for a combustion reaction is: AB + oxygen â common oxide of A and B. In a complete combustion reaction, a reactant burns with oxygen to produce the most common oxides of the elements making up the substance that is burned.The combustion of methane means that it is possible to burn it. Chemically, this combustion process consists of a reaction between methane and oxygen in the air.he generic algebraic equation for a combustion reaction is: AB + oxygen â common oxide of A and B. In a complete combustion reaction, a reactant burns with oxygen to produce the most common oxides of the elements making up the substance that is burned.