(35 points) A rigid, 1 m3 tank is initially evacuated. Two streams are then allowed to flow into the tank. One stream contains a gas (A) with a molar flow rate of 1 mol/s at TA,in = 300 K and PA,in = 1 bar. The other stream contains a different gas (B) with a molar flow rate of 2 mol/s at TB,in = 300 K and PA,in = 1 bar. Gas A has a constant A p,mc of 5/2R, and gas B has a different constant B p,mc of 7/2R. The two gases are flowed into the tank until it reaches a final pressure of 20 bar, whereupon the valve is closed. The temperature of the surroundings is 300 K. You may treat both A and B as an ideal gas throughout the entire process. a. Find the final temperature immediately after the valve is closed and the tank stops filling. b. Find the heat transferred (Q) and the final pressure after the tank is in storage for a long period of time, and comes to thermal equilibrium with the surroundings. Answers: (a) 438 K, (b) Q = 1365 kJ, Pf = 13.7 bar