A gas undergoes the following reversible non flow process during its initial pressure of 15 bar and

A gas undergoes the following reversible non flow process during its initial pressure of 15 bar and
volume 1m^3/Kg to final pressure of 6bar and volume 2m^3 /Kg. a) Constant volume followed by
constant pressure b)Constant pressure followed by constant volume c) polytrophic process , pV^1.3=
C
Calculate the work done by the gas during each process.