Problem 3. (30 points) Pure air is flowing across a flat polymer plate impregnated with toluene at 298 K and a total pressure of 0.25 atm. The plate is 10 cm long and 20 cm in width. The air flow velocity is 1.1 m/s. The vapor pressure of toluene at 298 K is 0.037 atm and the diffusivity of toluene in air at 298 K and 1 atm is DAB = 0.087 cm/s. The viscosity and density of air at 0.25 atm and 298 K are u = 1.84 x 10-5 kg/(m s) and p = 0.296 kg/m3. Determine the evaporation rate of toluene from the plate in kgmol/s. = =