A vessel contains equal number of moles of helium and methane. Due to a hole in the vessel, half of the gaseous mixture effused out. What is the ratio of the number of moles of helium and methane remaining in the vessel?

Explanation

(i) relation between molecular weight and rate of effusion
(ii) determination of the ratio of the number of molecules of helium and methane which are effused out
(iii) calculation of the ratio of the remaining molecules
(iv) `(2x)/3` moles