Q3(B). A rigid vessel of 0.05m3 volume contains an ideal gas, Cv=(5/2)R, at 500 K and 1 bar. (a) If heat in the amount of 12000J is transferred to the 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 10KJ is done on the gas, what is the entropy change of the gas if the process is adiabatic? What is Stotal ? What is the irreversible feature of the process? (12 M)