7.125 Steam enters an adiabatic turbine at 7 MPa, 600 degrees C, and 80 m/s and leaves at 50 kPa, 150 degrees C and 140 m/s. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine.