At `400K` the root mean square (rms) speed of a gas x (mol. wt. =40) is equal to the most probable speed of gas y at `60K` Find the molecular weight of gas y .

Answer

4

Explanation

`u_(rms) =u_(MP)`
`sqrt((3RT)/(M_(x)))=sqrt((2RT)/(M_(y)))`
`:.sqrt((3Rxx400)/(40)) =sqrt((2Rxx60)/(M_(y)))`
`M_(y) =4` .