CO$2($A$)$ diffuses through a stagnant layer of air $($B$),1c.$ at a temperature of $298K$ and pressure of $1$atm. $($a$)$ Calculate the concentration of $A.($b$)$ If the molar flux of $A$ is $1\mathrm{.}922{10}^{-5}$ gmol$/c{m}^2.s,$ calculate molar average velocity of the diffusing ges, A$.$

Given:

$R=82\mathrm{.}1(c{m}^3)\frac{\text{a}\text{r}\text{m}}{K}(gmol),$