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A 500-L insulated tank contains air at 40C, 2 MPa. A valve on the tank is opened, and air escapes until half the original mass

A 500-L insulated tank contains air at 40°C, 2 MPa. A valve on the tank is opened, and air escapes until half the original mass is gone, at which point the valve is closed. What is the pressure inside then?

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