A real qas in a piston$-$cylinder device is initially at $100$kPa and $2m^3.$ After a polytropic process $(n=1,3),$ the volume of the qas is compressed to $0,4m^3.$ A$)$ Determine, final pressure of qas $($kPa$)$

B$)$ Moving boundry worte done $(k{j}^{})$

C$)$ Show the process on a P$-$V dragram