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12. A membrane having a thickness of 2103cm, a permeability of A equal to 400x 1010cm3(STP)cm/(scm2cmHg), and a selectivity of 10 is to be used

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12. A membrane having a thickness of 2103cm, a permeability of A equal to 400x 1010cm3(STP)cm/(scm2cmHg), and a selectivity of 10 is to be used to separate a gas mixture of A and B. The feed flow rate is 2103cm3 (STP) /s and its composition is 0.413 mole fraction A. The feed side pressure is 80cmHg and the permeate side pressure is 20cmHg. The reject composition is to be 0.30 mole fraction A. Using the arithmetic method, calculate the permeate composition. a. 0.738 b. 0.262 c. 0.523 d. none of these

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