In the boiler of a power plant are tubes through which water flows as it is brought from 0.8 MPa, 150C to 240C at essentially constant pressure. The total mass flow rate of the water is 100 kg/s. Combustion gases passing over the tubes cool from 1067 to 547C at essentially constant pressure. The combustion gases can be modeled as air as an ideal gas. There is no significant heat transfer from the boiler to its surroundings. Surrounding (dead state) temperature and pressure are given as 25C and 1 atm, respectively. Determine (a) the mass flow rate of the combustion gases (in kg/s), (b) the rate of exergy destruction (in kW), (c) the exergetic efficiency (the second law efficiency) of the boiler.