1.

If `0.2 mol` of `O_(2)` vapours can effuse from an opening in a heated vessel in 20 second how long will it take `8 gm H_(2) (g)` to effuse under same conditions.A. `600 sec`B. `100 sec`C. `400 sec`D. `200 sec`

Answer» Correct Answer - B
`(r_(O_(2)))/(r_(H_(2))) = sqrt((M_(H_(2)))/(M_(O_(2))))`
`((Delta n)/(t))_(o_(2))/(((Delta n)/(t))_(H_(2))) = sqrt((2)/(32))`
`((0.2)/(20))/((4)/(t)) = sqrt((1)/(16))`
`t = (400)/(4) = 100 sec`


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