An evacuated 150-L tank is connected to a line flowing air at room temperature, 25oC, and 8 MPa pressure. The valve is opened, allowing air to flow into the tank until the pressure inside is 6 MPa. At this point the valve is closed. This filling process occurs rapidly and is essentially adiabatic. The tank is then placed in storage, where it eventually returns to room temperature. What is the final pressure and the amount of heat exchanged with the surroundings during storage?

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