Containers A and B in FIGURE CP18.73 hold the same gas. The volume of B is four times the volume of A. The two containers are connected by a thin tube (negligible volume) and a valve that is closed. The gas in A is at 300 K and pressure of 1.0 × 10⁵Pa.
The gas in B is at 400 K and pressure of 5.0 × 10⁵Pa. Heaters will maintain the temperatures of A and B even after the valve is opened. After the valve is opened, gas will flow one way or the other until A and B have equal pressure. What is this final pressure?

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A 300 K 400 K Valve FIGURE CP18.73