A400-L tank,A(see Fig. P3.47), contains argon gas at 250 kPa and 30◦C. Cylinder B, having a frictionless piston of such mass that a pressure of 150 kPa will float it, is initially empty. The valve is opened, and argon flows into B and eventually reaches a uniform state of 150 kPa and 30◦C throughout. What is the work done by the argon?

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Po Argon g A B FIGURE P3.47