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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 produced by a propane grill is a form of energy. When you. write the chemical equation for the combustion of propane, you can. include âheatâ on the right side of the equation. C3H8 5O2 h3CO2 4H2O Heat. This equation states that the heat released in the reaction came from. the reactants.