A rigid container $($volume $\{$:$=1\mathrm{.}85f{t}^3)$ contains $0\mathrm{.}24$ lbm of air, initially at $24$ psia $.$ Heat is then added

to the air until the pressure inside the container reaches $72$ psia $.$ Assume that there is negligible heat

loss during the process. Using the approximate analysis $($use $700F$ as the reference temperature for

evaluating specific heats$),$ calculate the

a$)$ Initial and final temperatures of air in the container

b$)$ Total amount of heat added $($Btu$)$ during the heating process

c$)$ Change in entropy for the air $(Bt\frac{u}{}R)$ during the process