A steady stream of air at $300\backslash$deg F and $5$ atm is available to produce work. How much work can be obtained from each Ibmol of air flowing through a reversible device that leaves at $77$ of and $1$ atm? The device may exchange heat with the surroundings at $77\backslash$deg F$.$ Assume the airfollows Clausius gas behavior, P$($V $-$ b$)=$ RT $($b $=0\mathrm{.}58$ ft $/$Ibmol$),$ with a constant heat capacity ofCp$*=7\mathrm{.}0$ Btu$/$Ibmol $\backslash$deg R$.$Note: $1$ atm $=14\mathrm{.}7$ lb$/$in$?$ and $1$ Btu $=778\mathrm{.}17$ ft$-$Ibf