Water vapor at 5 bar. 320 degree C enters a turbine operating at steady state with a mass flow rate of 1.5 kg/s and expands adiabatically to an exit state of 1 bar. 160 degree C. Kinetic and potential energy effects can be neglected. Sketch 1-2 and l-2s on the T-s diagram. (15') Find isentropic turbine efficiency. (10').