申論題

2. A cylinder (cross-sectional diameter of 0.01128 m) containing chloropicrin (CCl₃NO₂) is placed in a hood. The hood has a blower system that continually circulates dry air at a constant temperature 25℃ and 1 atm pressure. Originally, the liquid surface is 0.0388 m from the top of the cylinder. After one day the liquid level is 0.0412 m below the top. The vapor pressure and density of CCl₃NO₂ are 3178.3 N/m² and 1650 kg/m³, estimate the substances diffusivity in air. Molecular weight of CCl₃NO₂ is 164.39. (20%)