Ammonia gas $(A)$ is diffusing through a uniform tube $0\mathrm{.}10m$ long containing nitrogen gas $($B$)$ at a constant pressure of $1\mathrm{.}0132{10}^{5}Pa$ and $303K.$ At point $1,p_{A1}=1\mathrm{.}013{10}^{4}Pa$ and at point $2,p_{A2}=0\mathrm{.}507{10}^{4}Pa.$ The diffusivity $D_{AB}=0\mathrm{.}89{10}^{-4}\frac{m^2}{(s)}$

Answer questions $14-16.$

$R=8\mathrm{.}314\frac{m^3*Pa}{\text{m}\text{o}\text{l}\text{.}K}$

$14-$Calculate the diffusivity $D_{BA}$

A$)0\mathrm{.}890{10}^{-4}\frac{m^2}{(s)}$

B$)-0\mathrm{.}890{10}^{-4}\frac{m^2}{(s)}$

C$)0\mathrm{.}245{10}^{-4}\frac{m^2}{(s)}$

D$)-0\mathrm{.}245{10}^{-4}\frac{m^2}{(s)}$