Equimolar counter diffusion is occurring at steady state in a tube $0\mathrm{.}11$ m long containing N$2$ and CO gases at a total pressure of $1\mathrm{.}0$ atm absolute$.$ The partial pressure of N$2$ is $80$ mmHg at one end and $10$ mmHg at the other end.

$($a$)$ Predict the diffusivity by the Wilke$-$Lee method and compare the result with the experimental value.

$($b$)$ Calculate the flux in kmol.s$-1.$m$-2$ at $298$ K for N$2.$

$($c$)$ Repeat part $($b$)$ at $473$ K$.$ Does the flux increase?

$($d$)$ Repeat at $298$ K but for a total pressure of $3\mathrm{.}0$ atm absolute$.$ The partial pressures of N$2$ remains at $80$ and $10$ mmHg$.$ Does the flux change?