Q.3 A membrane having a thickness of 2 x 10-3 cm, a permeability PA = 400 x 10-10 cm3 (STP) cm/(s.cm2.cm Hg), and an * = 10 is to be used to separate a gas mixture of A and B. The feed flow rate is qf = 2 x 10 3 cm3 (STP)/s and its composition is xf = 0.413. The feed-side pressure is 80 cm Hg and the permeate-side pressure is 20 cm Hg. The reject composition is to be x0 = 0.30. Using the complete-mixing model, calculate the permeate composition, the fraction of feed permeated, and the membrane area.