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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.
Equations for the Three Alcohols: This is the formula for all alcohols: Cn H2n+1 OH The molar heat of combustion is the heat liberated when one mole of alcohol is burnt in a plentiful supply of air. These are the formulas for the combustion of the three alcohols.