118 An insulated, rigid tank whose volume is 0.5 m3 is connected by a valve to a large vessel holding steam at 40 bar, 500 degrees C. The tank is initially evacuated. The valve is opened only as long as required to fill the tank with steam to a pressure of 20 bar. Determine (a) the final temperature of the steam in the tank, in degrees C, (b) the final mass of the steam in the tank, in kg, and (c) the amount of entropy produced, in kJ/K.