Challenge: The gases $x$ and $Y$ are stored in tank $1$ and $2.$ The tanks are maintained at constant pressure of $2,6{10}^{5}Pa$ and temperature of $204$K$.$ A uniform tube $(0\mathrm{.}12m$ long$)$ connects the tanks. The partial pressure of $Y$ at point $1$ is $0,9{10}^{4}Pa$ and, at point $2$ is $1\mathrm{.}8{10}^{4}Pa.$ The diffusivity is $0\mathrm{.}32{10}^{-4}\frac{m^2}{s}$ and $R=8314m^{3}P\frac{a}{K}$gmol.K$.$

a$)$ Calculate the molar flux for $x$

b$)$ Calculate the molar flux for $Y$