question #2...please answer as detailed as possible with as much explanation as possible

Question 2: It is desired to determine the membrane area needed to separate an air stream using a membrane 1mm thick with an oxygen permeability of P'A = 500x10-10cm3 (STP).cm/ (s.cm.cmHg). An a*=10 for oxygen permeability divided by nitrogen permeability will be used. The feed composition is 0.413 mole fraction and feed rate is L=1x106 cm3 (STP)/s and the fraction cut 0=0.20. The pressures selected for use are pn = 80cmHg and p = 20cmHg. Again, assuming the complete mixing model, calculate the permeate composition, the reject composition and the area. =