Consider the well-insulated, rigid container shown in the following fi gure. Two compartments, A and B, contain H2O and are separated by a thin metallic piston. Side A is 50 cm long. Side B is 10 cm long. The cross-sectional area is 0.1 m2.

The left compartment is initially at 10 bar and 700°C; the right compartment is initially at 20 bar and 250°C. 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 entropy change of the universe for this process.

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