A tube contains toluene (see die figure to the side) is subjected to a stream of toluene free air at 25 degree C and 1.0 times 10^5 Pa. In 10^5 seconds, 2 grams of toluene evaporated. Estimate the diffusivity of Toluene in air given die following information: Tube diameter and length = 5 mm and 25 cm, molar mass of Toluene = 92 kg/kgmol, initially the height of the toluene liquid in the tube= 15 cm, die vapor pressure of toluene = 10 times 10^4 Pa, and the density of toluene =850 kg/m^3. Calculate the flux of toluene?