Toluene liquid is poured into a vertical glass tube that has a diameter of 3 mm and is positioned 2 cm below the top open end. The level has decreased to 7.9 cm from the top after being at 40 C and 760 mm Hg of total pressure for 300 hours. Diffusivity should be calculated. Data: vapor pressure of toluene at 39.4C = 57 mm Hg density of liquid toluene = 850 kg/m3 Molecular weight of toluene = 92