1. Diffusion of Benzene in Air (6 pts) A 30 -cm-Iong tube, with an inner diameter of 1.0cm has liquid benzene filling it to a height of 10 cm from the bottom, with the rest containing stagnant air and evaporated benzene with a total gas pressure of 1atm. Liquid benzene has a density of 0.85g/cm3. The temperature is 300K, at which benzene has a vapor pressure of 0.20atm. Airflow over the top of the removes the vaporized benzene. It was determined that 72h were required to completely evaporate the benzene initially loaded in the tube. Estimate the binary gas-phase diffusion coefficient for benzene in air using these data