Problem $17\mathrm{.}1.$

$C{O}_2$ is diffusing through $N_2$ in one direction at atmospheric pressure and $0C.$ The mole fraction of $C{O}_2$ at point $A$ is $0\mathrm{.}2$ ; at point $B,3m$ away, in the direction of diffusion, it is $0\mathrm{.}02.$ Diffusivity $D_v$ is $0\mathrm{.}144c\frac{m^2}{s}.$ The gas phase as a whole is stationary; that is$,$ nitrogen is diffusing at the same rate as the carbon dioxide, but in the opposite direction.

$($a$)$ What is the molal flux of $C{O}_2,$ in $kg$ moles $\frac{?}{m^2}*h?$

$($b$)$ What is the net mass flux, in $k\frac{g}{m^2}*h?$

$($c$)$ At what speed, in $\frac{m}{s},$ would an observer have to move from one point to the other so that the net mass flux, relative to him or her, would be zero?

$($d$)$ At what speed would the observer have to move so that, relative to him or her, the $N_2$ is stationary?

$($e$)$ What would be the molal flux of $C{O}_2$ relative to the observer under condition $($d$)?$