Calculate the rate of diffusion of acetic acid $($A$)$ across a film of non$-$diffusing water $($B$)$ solution $1mm$ thick at $17C$ when the concentrations on opposite sides of film are, $9wt\%$ and $3wt\%$ respectively. The diffusivity of acetic acid in the solution is $0\mathrm{.}65{10}^{-9}\frac{m^2}{s}.M_A=60\mathrm{.}03,M_8=18\mathrm{.}02.$ The density of $9\%$ and $3\%$ solution at $17C$ are $1012k\frac{g}{m^3}$ and $1003\mathrm{.}2k\frac{g}{m^3}.$