You mix 2.0 moles of solid ethanol at 149 K with 3.0 moles of liquid ethanol at 293 K in a well- insulated container so that no heat transfer between the system and surroundings can occur. You allow the system to come to equilibrium and discover that you now have 5 moles of liquid ethanol at a temperature of 218 K. What is the enthalpy of fusion of ethanol?