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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.
1 The following steps allow the calculation of an experimental value for the molar heat of combustion of ethanol: 2  Measure and record the mass of a burner containing ethanol. 3  Measure 100 mL of water into a beaker and measure the temperature of the water. 4  Place the beaker of water directly above the burner and light it.