An insulated, vertical piston-cylinder device initially contains 11.56 kg of water, 6.94 kg of which is in vapor phase. The mass of the piston is such that it maintains a constant pressure of 200 kPa inside the cylinder. Now steam at 0.5 MPa and 350 degrees Celsius is allowed to enter the cylinder from a supply line until all the liquid in the cylinder has vaporized. Determine a) the final temperature in the cylinder and b) the mass of the stream that has entered.