The diffusivity of the gas pair O2 -CC14 is determined by observing steady state evaporation of CC14 (liquid) into a tube containing O2. The entire system is held at constant temperature and pressure. Both the gases are assumed to be ideal and O2 is stationary. The distance between the CCl4 liquid level and the top of the tube is 0.171m. The total pressure on the system is 100.658 x 10 N/m (775 mm Hg) and the temperature is 273 K. The vapour pressure of CC14 is 4.339 x 10 N/m (33 mm Hg) at that temperature. The cross sectional are of the tube is 0.082 x 10 m. After steady state is attained, 0.028 x 104 m of CCl4 (liquid) is evaporated in 36 x 10 second period. What is the diffusivity of the gas pair CCl4-02? Assume specific gravity of the liquid CCl4 as .1.59. (16) (Nov/Dec '08)