7-217 A piston-cylinder device contains 5 kg of saturated water vapor at 3 MPa. Now heat is rejected from the cylinder at constant pressure until the water vapor completely condenses so that the cylinder contains saturated liquid at 3 MPa at the end of the process. The entropy change of the system during this process is a) 0 kJ/K b) -3.5 kJ/K c) -12.5 kJ/K d) -17.7 kJ/K e) -19.5 kJ/K | |
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