Steam at 5.0 MPa, 500 degrees C enters an insulated turbine operating at a steady state with a mass flow rate of 7kg/s and exits at 0.3 MPa. Kinetic and Potential energy effects are negligible. Determine the maximum theoretical power that can be developed by the turbine, in KW, and the corresponding exit temperature. if the steam exits the turbine at 250 degress C and 0.5 MPa, determine the isentropic efficiency.