Ammonia is diffusing through a stagnant

pas mixture consisting of one$-$third $N_2$

and two$-$thirds $H_2$ by volume. The total

pressure is $206\mathrm{.}8k\frac{N}{m^2}$ and the $T$ is

$54C.$ Calculate the rate of diffusion of

the ammonia through a film of gas

$0\mathrm{.}5mm$ thick when the concentration

change across the film is $10$ to $5\%$

ammonia by volume.