I believe this question has to do with Maxwell-Stefan concepts. PLEASE ANSWER THOROUGHLY! I WILL UPVOTE GOOD ATTEMPTS!

The mass transfer in a distillation column is modeled as in a falling laminar film. At the gas/liquid interface, the water mole fraction is 0.60 and the 2-ethoxyethanol mole fraction is 0.40 . The bulk entering liquid water mole fraction is 0.65 . The film is 50mm thick, 2.0cm wide, and 10.0cm long. Assume short contact time applies. The liquid molar density is 19.45kmol/m3. The film velocity is 6108m/s. Assume a diffusivity of 6.5109m2/s at 115C and 1 atm. a. Is the flow situation EMD or UMD, and how can you tell? b. The flux is proportional to the product of the molar density and the diffusivity. Estimate (order of magnitude) this product for the liquid and vapor phases, and explain whether the mass transfer in the gas phase or the liquid phase will be the rate-limiting step. c. From your answer to b, is a solution based on a liquid-film solution likely to be a good answer? Why? d. Modify equation 15.51a from the textbook to find the average exiting mole fraction: yA,surfyA,inityA,LyA,init=1erfvy4DABz