An insulated rigid tank is divided into two chambers by a membrane. Chamber A has a volume of 3 Ft^3 and intially contains nitrogen (N2) at 77 F and 100 lbf/in^2 (state A1) while the chamber B is evacuated. The membrane now breaks and N2 expands to fill the entire tank. the final pressure is observed to be 20 lbf/in^2 (state 2) considering that N2 behaves as an ideal gas with variable specific heats, Determine:
A) The final Temperature (F)
B) The volume of the chamber B (ft^3)
C) the total entropy production (Btu/R)