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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)
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.