A thermally insulating container has a membrane separating the container into two equal parts. In one part is a vacuum. In the other part is an ideal gas of temperature T and internal energy U . The m

Question

A thermally insulating container has a membrane separating the container into two equal parts. In one part is a vacuum. In the other part is an ideal gas of temperature T and internal energy U . The membrane is punctured and the gas rushes into the region which was vacuum. After the system has returned to equilibrium, which of the following is NOT true for the gas?

TestHub · Accepted Answer

Free expansion into vacuum against no external pressure: W = 0 ; insulated container: Q = 0 . Hence Δ U = 0 : internal energy and temperature stay unchanged (C, D true). The NOT-true statements are A (temperature decreases) and B (positive work by the gas).

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