$4($b$)\_$#$2$: Two rigid tanks both containing Nitrogen, N$2,$ are connected by a valve. Tank A is $20$

ft$3$ at $60$ oF$,29$ lbf$/$in$2.$ Tank B is $35$ ft$3$ at $120$ oF$,16$ lbf$/$in$2.$ When the valve is opened the

system comes to equilibrium with the surroundings at $77$ oF$.$

$($a$)$ Determine the final pressure, lbf$/$in$2,$ of the system.

$($b$)$ Determine the heat transfer, Btu, for the process.

$($c$)$ The amount of entropy produced, Btu$/$oR$.(0\mathrm{.}0367$ Btu$/$oR$)$