A two-phase, liquid–vapor mixture of H2O, initially at x = 30% and a pressure of 100 kPa, is
contained in a piston-cylinder assembly, as shown in the figure. The mass of the piston is 10 kg,
and its diameter is 15 cm. The pressure of the surroundings is 100 kPa. As the water is heated,
the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to
the water continues at constant volume until the pressure is 150 kPa. Friction between the
piston and the cylinder wall and kinetic and potential energy effects are negligible. For the
overall process of the

Question

A two-phase, liquid–vapor mixture of H2O, initially at x = 30% and a pressure of 100 kPa, is
contained in a piston-cylinder assembly, as shown in the figure. The mass of the piston is 10 kg,
and its diameter is 15 cm. The pressure of the surroundings is 100 kPa. As the water is heated,
the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to
the water continues at constant volume until the pressure is 150 kPa. Friction between the
piston and the cylinder wall and kinetic and potential energy effects are negligible. For the
overall process of the