The frictionless piston shown in equilibrium has a mass of 64 kg (Fig. 3-16). Energy is added until the temperature reaches 220 °C. The atmospheric pressure is 100 kPa. Determine (a) the initial pressure, (b) the initial quality, (c) the quality when the piston just hits the stops, (d) the final quality (or pressure if super- heat), (e) the work done on the piston. Stop 20 mm. Piston. Water vapor 36 mm. Liquid 200 mm: 0.4 mm