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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)
â¢ heat of reaction â¢ molar heat of reaction â¢ average molar heat of reaction â¢ average deviation â¢ H fÂ° of MgCl 2, kJ/mole (experimental) â¢ % error of H fÂ° of MgCl 2, kJ/mole from literature value given in class. â¢ To find the H fÂ° of MgO, kJ/mole (experimental), use Hessâs Law. You will have gotten your target reaction ( H fÂ° reaction of MgO) by the end of the lab.