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.

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.

For a reversible adiabatic process the change in entropy is A. Zero B. Minimum C. Maximum D. Infinite

Thermodynamics - sketch the device sketch at states 1 and 2. Plot and label the process on a P-v diagram. 6.136E. Helium in a piston/cylinder at 70 F, 20 psia is brought to 720 R in a reversible polytropic process with exponent n = 1.25. Find the final pressure and both the specific heat transfer and the specific work.