question: Gas A is diffusing in a mixture of gas B at total pressure of $1\mathrm{.}1$

atm at $300K.$ Concentration of gases at places which are $1cm$ apart are

$12$ and $20\%(\frac{V}{V})$ respectively. Using the diffusivity of $A$ in $B$ as

$1,89*{10}^{-5}\frac{m}{s}$;

Calculate the flux of $A$

p$.$s$.$

$R=8314m^{3}P\frac{a}{K}$gmol.$K$