Consider the well-insulated, rigid container shown below. Two compartments, A and B, contain H2O and are separated by a thin metallic piston. Side A is 10 cm long. Side B is 50 cm long. The cross-sectional area is 0.1 m2. The left compartment is initially at 20 bar and 250ºC; the right compartment is initially at 10 bar and 700ºC. The piston is initially held in place by a latch. The latch is removed, and the piston moves until the pressure and temperature in the two compartments become equal. Determine the fi nal temperature, the fi nal pressure, and the distance that the piston moved.

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Well-insulated wall A P1,A = 20 bar T1,A = 250C HO 10 cm Latch Thin metallic piston B P1,B= 10 bar T1,8 = 700C HO 50 cm