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At `400 K`, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60 K. The molecular we

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At `400 K`, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60 K. The molecular weight of the gas Y is.
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`(sqrt((3RT)/(m)))_(X) = (sqrt((2RT)/(m)))_(Y)`
`sqrt((3 R 400)/(40)) = sqrt((2 R 60)/(m))`
`sqrt(30) = sqrt((4 xx 30)/(m))`
`m = 4`
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