9. A rigid tank initially contains 1.4 kg saturated liquid water at 200 °C. At this state, 25

percent of the volume is occupied by water and the rest by air. Now heat is supplied to

the water until the tank contains saturated vapor only. Determine (a) the volume of the

tank, (b) the final temperature and pressure and (c) the internal energy change of the

water.

Water

1.4 kg

200°C

Q