A stagnant film of ethanol $($A$)-$water $($B$)$ solution with a thickness of $3$ mm is at $273$K$.$ The film is in contact at one surface with an organic solvent in which ethanol is soluble but water is insoluble $($N $0).$ The concentration of ethanol at one side of the film $($point$1)$ is $15\%($w$/$w$),$ and the density of the solution at this point is $972\mathrm{.}8$ ke$/$m$,$ the concentration of ethanol and density of the solution at the other side $($point$2)$ are $5\%($w$/$w$)$ and $988\mathrm{.}1$kg$/$m$^3,$ respectively. If the diffusivity of ethanol is $0\mathrm{.}7$x$10-$ m$^2/$s$,$ calculate the flux with an assumption of steady$-$state.