Pure aniline is evaporating through a stagnant air film of $1$ mm thickness at $300$ K and a total pressure of $100$ KPa. The vapor pressure of aniline at $300$ K is $0\mathrm{.}1$ KPa. The total molar concentration under these conditions is $40\mathrm{.}1$ mole$/$m$3.$ The diffusivity of aniline in air is $0\mathrm{.}7410-5$m$2/$s$.$ The numerical value of mass transfer co$-$efficient is $7\mathrm{.}410-3.$ The rate of evaporation of aniline is $2\mathrm{.}9710\text{'}-4.$ Its units are

mole$/$s

mole$/$cm$2.$s

mole$/$m$2.$s

k$.$mole$/$m$2.$s