5 kg of air at 1300 K and 6 bar is expanded isentropically to 2 bar. Find the outlet temperature, inlet and outlet volume, specific work, total work, and change in entropy due to the expansion.   clear writing please

A room is divided by a barrier into two sections. One side of the room (state 1) has a volume of 1000 ft^3 and is initially at 70F, 50 psi and the other side of the barrier (state 2) has 200 lbm of air and is initially at 300F, 14.696 psi. The divider is removed and the air mixes until it reaches equilibrium (state 3). Find the final temperature and pressure of the room. You can assume removing the divider has a negligible effect on the air.

From a state defined 300 psia, 100 cu. ft and 245 deg. F, Helium undergoes an Isentropic process to 0.5 psig. Find: a. V2 and T2 b. Change in Enthalpy and Internal Energy c. Heat and Change in Entropy.