Question

Under conditions in which the density of `CO_2` is 1.96gL and that of `N_2` is 1.25 gL , which gas will effuse more rapidly? What will the ratio of the rates of effusion of `N_2` to `CO_2`?

Answer 1

`N_2` is less dense so will effuse more rapidly.

Graham's Law states:

`Rprop(1)/(sqrtM_r)`

In this case:

`(R_(CO_2))/(R_(N_2))=sqrt((M_r(N_2))/(M_r(CO_2))) = sqrt((28)/(44))=0.8`

Here is a video which shows how to solve a different problem using Graham's law.

video from: Noel Pauller

Hope this helps!