A steam turbine operates adiabatically with a steam rate of 25 kg s-1. The steam is supplied at 1300 kPa and 673.15 K (400°C) and discharges at 40 Wa and 373.15 K (100°C). Determine the power output of the turbine and the efficiency of its operation in comparison with a turbine that operates reversibly and adiabatically from the same initial conditions to the same final pressure.