The spring-loaded piston-cylinder device is filled with 0.5 kg of water vapor that is initially at 4 MPa and 400oC. Initially, the spring exerts no forces against the piston. The spring constant in the spring forces relation F = kx is k = 0.9 kN/cm and the piston diameter is D = 20 cm. The water now undergoes a process until its volume is one-half of the original volume. Calculate the final temperature and the specific enthalpy of the water.