A rigid tank is divided into two equal parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 400 kPa and 60°C while the other part is evacuated. The partition is now removed, and the water expands to fill the entire tank. Determine the entropy change of water during this process, if the final pressure in the tank is 40 kPa. Use steam tables. compressed liquid 400 kPa 60°C Vacuum The entropy change of water during this process is kJ/K.

An insulated piston-cylinder device contains 0.5L of saturated liquid water at a constant pressure of 100 kPa. An electric resistance heater inside the cylinder is now turned on, and 1178.36 kJ of electrical work is transferred to the steam. Determine (a) the entropy change of the water during this process; (b) the entropy generation during this process? 1178.36 kJ M H₂O 100 kPa Sat. liquid

A thermostat-controlled 15-kW backup electric resistance heater turns on whenever necessary to keep the house at 22°C. Determine how long the electric heating system is on during this night and the amount of entropy generated during the night.