Water in a piston/cylinder is at 300 kPa and 300. There are two stops, a lower one at which = 1 3 (second set) and an upper one at = 33 (first set).

a) State 1: the piston rests on the first set of stops.

b) State 2: when heat is removed from water and the pressure drops at 175 kPa while the piston is still on the first set of stops

c) State 3: when additional heat is removed and the piston reaches the second set of stops.

d) State 4: more heat is removed from the system while the piston rests on the second set of stops and the pressure drops at 75 kPa.

Determine :

1. The work done between the system and the environment in kJ. Is this useful work?

2. If the environment is kept at a temperature of 20, which is the change of entropy of the environment during the whole process?

3. Calculate the total entropy change and make a comment on the feasibility of the whole process.