6. Diffusivity. the diffusivity of volatile solvents is frequently measured using an Arnold cell. Here, a vertical glass tube 10 cm in length with a surface area (S =1 cm²) is filled to the top with dichloromethane and placed at 24°C and standard atmospheric pressure while dry air is blown over the top. The entire column of dichloromethane takes 12 hrs to evaporate. a b) c) What is the diffusion coefficient of dichloromethane in air under these conditions? Useful info: the vapor pressure of dichloromethane at 24°C is 400 mmHg (53.3kN/m²), MW=84.9 g/mol, PA = 1.33g/cm³. Would the results in part (a) change if the tube had a larger cross-sectional surface area? Explain. Based on your results in part (a), what would be the diffusivity of dichloromethane be in air at