You are tasked to determine the diffusivity of cyclohexane in air experimentally. The set-up consists of a test tube which is 125 mm deep submerged to a water bath at 35C. At the top of the tube, a steady stream of air passes through. The initial height of the fluid in the tube was 100 mm, after 3 hours of laboratory work, the height was recorded to be 87.5 mm. You noted that barometric pressure at 765 mm Hg.

a. Determine the diffusivity (SI) of cyclohexane in air at the specified conditions.

b. How long (days) will it take for the whole sample of acetone to be evaporated.