Ice cubes at 0c are poured into a glass that contains 150g of liquid water at 20c. The contents of the glass are quietly stirred and after short time the ice melts as well as the liquid cools to 0 c. No considerable heat exchange with the environment takes place.
a) Compute the enthalpy change of the universe during the process. Cp=Cv = 4.18 kj/kgK
b) If the same process were performed reversibly explain how much useful work would be obtained from it?