4. Calculate the energy exchanged as heat when 18.0 g of gaseous ethanol, C2HsO(g) at 78.4 oC is converted completely to liquid ethanol, C2H,O(2) at 25.0 °C. Potentially useful data for ethanol are: Boiling point= 784°C Heat of vaporization = 41.7 kJ/mol Heat of fusion = 4.64 kJ/mol Molar heat capacity of C2H60(g) = 78.3 J/mol â Molar heat capacity of C2H60(1)-113 J/mol °C A) -4.16 kJ B) -18.6 kJ C) -859 kJ D) +18.6 k.J E) +4.16 kJ