A steam turbine operates adiabatically with a steam rate of 25 kg s-1. The steam is supplied at 1,300 kPa and 400oC and discharges at 40 kPa and 100oC. 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?