a 2. (25 Marks) Unimolar diffusion can be used to estimate the binary diffusivity of a binary gas pair as shown in the figure below. Consider the evaporation of CCl4 (A) into a tube containing O2 (B). The distance between the CCl4 level and the top of the tube is 16.5 cm. The total pressure in the system is 760 mm Hg and the temperature -5C. The vapor pressure of CCl4 at that temperature is 29.5 mm Hg. The area of diffusion path in the diffusion tube may be taken as 0.80 cm. Determine the binary diffusivity, DAB, in cm?/s, when in an 11-hour period after steady state 0.026 cm of CCl4 is evaporated. gas B PARO Pai= P Liquid A