A 10 m3 rigid tank contains saturated vapor of H2O at 200oC. The tank is cooled until

Question:

A 10 m3 rigid tank contains saturated vapor of H2O at 200oC. The tank is cooled until the quality drops to 80%. Determine the
(a) Mass of H2O in the tank.
(b) Drop in pressure (Δp).
(c) Drop in temperature (ΔT).
(d) Drop in total entropy (ΔS).
(e) What causes the entropy of this system to decrease?