An insulated, rigid tank whose volume is 0.5 m2 is connected by a valve to a large vessel holding steam at 40 bar, 500°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 the final temperature of the steam in the tank, in °c, and the final mass of the steam in the tank, in kg.