`50` volumes of hydrogen take `20 min` of diffuse out of a vessel. How long will `40` volumes of oxygen take to diffuse out from the same vessel under the same conditions?

Explanation

Rate of diffusion for hydrogen, `r_(1) = (50)/(20)`
Rate of diffusion for oxygen, `r_(2) = (40)/(t)`
Mol. Mass of hydrogen `= 2`
Mol. Mass of oxygen `= 32`
So `(50//20)/(40//t) = sqrt((32)/(2)`
or `(50)/(20) xx (t)/(40) = 4`
`t = 64` minute