Superheated steam enters an insulated turbine at 20 MPa and 600 C at a mass flow rate

Question:

Superheated steam enters an insulated turbine at 20 MPa and 600° C at a mass flow rate of 1000 kg/min. If the steam leaves the turbine at
a) 10 kPa,
b) 40 kPa,
c) 80 kPa as a saturated vapor, what are the power output and the rate of change of entropy of the steam?