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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.
(a) Calculate the standard enthalpy change for the combustion of 1 mol of benzene, C 6 H 6 (l), to CO 2 (g) and H 2 O (l). (b) Compare the quantity of heat produced by combustion of 1.00 g propane to that produced by 1.00 g benzene. SOLUTION (a) We know that a combustion reaction involves O 2 (g) as a reactant.