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A non–conducting container is divided into two chambers that are separated by a valve. The left chamber contains one mole of a mono atomic ideal gas. The right chamber is evacuated. At some instant, the valve is opened and the gas rushes freely into the right chamber. Which are of the following statements concerning this process is true?

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Work is done by the gas

The temperature of the gas decreases

The walls of the containing vessel must get colder

The change in the internal energy of the gas is zero

answer is D.

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Detailed Solution

In a free expansion $Δ W = 0, Δ Q = Δ U + Δ W$ as $Δ W = 0$ and walls are non conductivity so $Δ Q = 0$ hence $Δ U = 0$

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