A steam turbine operates at steady state with inlet conditions of P_1 = 5 bars, T_1 = 320°C. Steam leaves the turbine at a pressure of 1 bar. The turbine is adiabatic, and kinetic and potential energy changes are negligible. If the isentropic turbine efficiency is 75%, determine the work per unit mass flow in KJ/kg, and plot on an h-s diagram.