$4($b$)\_$#$2$: Two rigid tanks both containing Nitrogen, N$2,$ are connected by a valve. Tank A is $20f{t}^3$ at $60F,29lb\frac{f}{i}{n}^2.$ Tank B is $35f{t}^3$ at $120F,16lb\frac{f}{i}{n}^2.$ When the valve is opened the system comes to equilibrium with the surroundings at $77F.$

$($a$)$ Determine the final pressure, $lb\frac{f}{i}{n}^2,$ of the system.

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

$($c$)$ The amount of entropy produced, Btu$/R.(0\mathrm{.}0367Bt\frac{u}{}R)$