Question $3$

Ammonia gas $(A)$ and nitrogen gas $(B)$ are diffusing counterdiffusion through a straight glass tube

$0\mathrm{.}610m$ long with an inside diameter of $24\mathrm{.}2mm$ at $298K$ and $101\mathrm{.}32$kPa as shown in Figure $1.$

Both ends of the tube are connected to large mixed chambers at $101\mathrm{.}32$kPa. The partial pressure

of $N{H}_3$ is constant at $20$kPa in one chamber and $6\mathrm{.}666$kPa in the other. The diffusivity at $298K$

and $101\mathrm{.}32$kPa is $2\mathrm{.}30{10}^{-5}\frac{m^2}{s}$ and $R=8314m^3.P\frac{a}{k}$gmol. K$.$ Determine:

$($a$)$ The diffusion of $N{H}_3$

$($b$)$ The diffusion of $N_2$

Figure $1$: Equimolar counterdiffusion of gases A and $B$