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A porous container is filled with a gas mixture. Which gas would leak faster from the container when it is placed in vaccum?

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IF the temperature is constant ,rms speed of gas molecules is inversely proportional to the molecular weight of the gas i.e, `c prop 1/sqrtM`.
So, the rms speed of the lighter gas molecules is higher than that of heavier gas molecules. As a result,the lighter gas would leak faster through the pores of the container.
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