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= 1211 kJ mol-1. Therefore the molar heat of combustion of ethanol is 1211 kJ mol-1 (The molar enthalpy of combustion of ethanol is 1211 kJ mol-1). (Note that the enthalpy change for the reaction is negative because the reaction is exothermic, so the enthalpy change for the reaction is -1211 kJ mol-1, ÎH = - 1211 kJ mol-1)
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.