A rigid vessel of 0.08m' volume contain an ideal gas, C,= 5/2 R, at 600K\ and 1 bar.\ a) If heat in the amount of 22,000 J is transferred to gas, determine its entropy change.\ b) If the vessel is fitted with a stirrer that is rotated by a shaft so that work in the amount of 15,000 J is done on the gas, what is the entropy change of the gas if the process is adiabatic? What is the ASta? What is the irreversible feature of the process?