How much heat energy is required to convert 73.8 g of solid ethanol at 114.5C to gasesous ethanol at 143.2C ? The molar heat of fusion of ethanol is 4.60 kJ/mol , and its molar heat of vaporization is 38.56 kJ/mol . Ethanol has a normal melting point of 114.5C and a normal boiling point of 78.4C . The specific heat capacity of liquid ethanol is 2.45J/gC , and that of gaseous ethanol is 1.43J/gC