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Given that αAB=2.0, Then equilibrium ratio of B is KB=0.7, Estimate αBA ?

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Given that αAB=2.0, Then equilibrium ratio of B is KB=0.7, Estimate αBA ?

(a) 0.9

(b) 0.65

(c) 0.5

(d) 0.6

This question was addressed to me in final exam.

Asked question is from Vapour Liquid Equilibrium in division Introduction to Distillation of Distillation Design

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The correct answer is (c) 0.5

Explanation: As α=KB/KA, 2.0= 0.7/KA, KA = 0.35 and αAB =KA/KB =0.35/0.7 = 0.5.

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