Which of the following equations are satisfied at azeotropic conditions?(a) A^v(v) + A^l(v) = 0(b) A^v(v) – A^l(v) = 0(c) A^v(v). A^l(v) = 0(d) A^v(v) =A^l(v)The question was posed to me during a job interview.The query is from Extractive Distillation in portion Azeotropic and Extractive Distillation of Distillation Design

Which of the following equations are satisfied at azeotropic condition

1.	Which of the following equations are satisfied at azeotropic conditions?(a) A^v(v) + A^l(v) = 0(b) A^v(v) – A^l(v) = 0(c) A^v(v). A^l(v) = 0(d) A^v(v) =A^l(v)The question was posed to me during a job interview.The query is from Extractive Distillation in portion Azeotropic and Extractive Distillation of Distillation Design
Answer» Correct ANSWER is (b) A^v(v) – A^l(v) = 0 For EXPLANATION: A^v(v) and A^l(v) are the Helmholtz energy of the vapor and LIQUID PHASES respectively, V, V^0 and V^l are the total molar volume.

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