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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 that is released in the combustion of the ethanol is absorbed by the calorimeter. The temperature change of the calorimeter is then related to the heat of combustion of ethanol (heat released in a reaction (combustion in this case) = heat gained by the calorimeter). Weigh a 600 mL tall form beaker. Add about 450 mL of DI water and weigh it again.