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An insulated rigid tank with a volume of 1 m’ is filled with air at 800 kPa, 25°C. A valve on the tank is opened, and the pressure inside quickly

drops to 150 kPa. At this point, the valve is closed. Assume that the air remaining inside has undergone a reversible adiabatic expansion. a- Draw P-v and T-s diagrams b- Calculate the mass withdrawn during the process.

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