Water vapor at 500 kPa and 320°C enters a turbine operating at steady state with a volumetric flow rate of 0.65 m^3/s. The water vapor expands through the turbine to an exit state of 100 kPa and 160°C. Assume kinetic and potential energy effects are negligible. Determine:
(a) the power output (kW) of the turbine.
(b) the change in specific entropy (kJ/kgK) from inlet to exit of the turbine.
(c) the isentropic efficiency (%) of the turbine.