- 3 Liquid Hexane Is Placed In A Vertical Glass Tube Of Inside Diameter 0 95cm The Tube Is 2 5 Closed At The Bottom An 1 (15.32 KiB) Viewed 11 times
2.5 closed at the bottom and open, at the top, to air flowing at a uniform pressure of 0.94 atm. The tube assembly is immersed in a 3 constant temperature bath T=19°C P=0.94 maintained at 19°C. The hexane 2 evaporates and diffuses through the 1.5 air column in the tube. The loss in volume of liquid hexane is recorded as a function of time, and 0.5 a set of data is shown in the figure 0 41NHMT14 at left. The initial length of the air 0 40 60 80 100 120 140 160 180 column above the hexane surface is time (h) 15.6cm. Liquid volume lost due to evaporation (mL) 1 20 Calculate the diffusion coefficient of hexane through air from these data. The vapor pressure of hexane at 19°C is 1.5 x 104 Pa, and the density of the liquid is 0.66g/cm3.