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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 heat of combustion is the energy released as heat when a compound undergoes complete combustion with oxygen under standard conditions.The chemical reaction is typically a hydrocarbon reacting with oxygen to form carbon dioxide, water and heat.It may be expressed with the quantities: 1  energy/ mole of fuel (kJ/mol).he heat of combustion is the energy released as heat when a compound undergoes complete combustion with oxygen under standard conditions.