In an extraction process, a liquid solution of A and $B$ is in contact at one surface with

solvent $C.A$ is soluble in solvent $C,$ while $B$ is insoluble. Mass transfer happens across a

stagnant film $1\mathrm{.}5mm$ thick at $295K.$ At point $1$ in the film, the composition of $A$ is $50\mathrm{.}3$

mol$\%$ and the solution density is $972k\frac{g}{m^3}.$ At point $2,$ A composition is $4\mathrm{.}2$mol$\%$ and

solution density is $986k\frac{g}{m^3}.$ The diffusion coefficient, $D_{AB}=0\mathrm{.}000000006\frac{m^2}{s}.$ Molecular

weight of $A$ is $32\frac{g}{m}ol$ and $B$ is $18\frac{g}{m}ol.$ The system is not dilute. Calculate the steady

state flux of $A(N_A)$ in $mo\frac{l}{m^2}.$s$.$