Steam enters a turbine with a pressure of 3 MPa, a temperature of 400oC and a velocity of 140 m/s. Steam exits as saturated vapor at 100oC with a velocity of 105 m/s. At steady state, the turbine develops work at a rate of 500 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 450 K. Determine the irreversibility per unit mass of steam flowing through the turbine in kJ/kg. Neglect PE.