when a patient applies eye drop for the treatment of glaucoma the eye drop transported to the tear system by a thin tear film. the eye drop diffuses to the eye at 25 degree through a thin tear film layer thickness of 0.07 mm and the concentration of the eye drop in the tear (point 1) and the other boundary of the tear film (point 2 ) is 34 wt% (density is 840 kg/m3) and 9 wt% ( density is (1030 kg/m3).The diffusivity of the eye drops in tears is 0.41x10^(-9) m2/s.Calculate the rate of diffusion of eye drop across a film.Molecular weight of the eye drop and tear is 320 kg/kmol and 235 kg/kmol.