Liquid benzene is poured into a vertical glass tube that has a 3 mm diameter and is 20 mm deep from the top openend. The level has decreased to 80 mm from the top after 275 hours at 25 C and a total pressure of 760 mm Hg. Determine the diffusivity's value. Data: vapor pressure of toluene at 39.4C = 0.14 atm density of liquid toluene = 876 kg/m3 Molecular weight of toluene = 78