Unsteady-State Energy Balances on Tanks: Example Problem

Try to solve this problem before watching the solution in the screencast.

Example Problem

A well-insulated tank contains 1.0 mol of an ideal gas (Cp = 28 J/(mol K)) at 1.5 bar and 404 K. This tank is connected (by an insulated line with a valve) to an insulated, evacuated tank of the same volume. What is the temperature in each tank when the valve is opened until the pressure equalizes in the two tanks?

image to help understand an example problem in the Unsteady-State Energy Balances for Tanks Module