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