Ethanol (C2H5OH) melts at -114°C and boils at 78°C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heat of solid and liquid ethanol are 0.97 J/g•K and 2.3 J/g•K respectively.
How much heat (kJ) is required to convert 24.0 g of ethanol at 21°C to the vapor phase at 78°C?
Express your answer using two significant figures.