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NTA Abhyas JEE Main2020ChemistrySolutionsPractice

For a mixture of two volatile,completely miscible liquids A and B, with P A ∘ = 500 torr and P B ∘ = 800 torr , What is the composition of last droplet of liquid remaining in equilibrium with vapour? Provided the initial ideal solution has a composition of x A = 0 .6 and x B = 0 .4

Options

  1. Ax A = 0.6 ; x B = 0.4
  2. Bx A = 0.5 ; x B = 0.5
  3. Cx A = 0.7 ; x B = 0.3
  4. Dx A = 0.3 ; x B = 0.7

Correct answer

C. x A = 0.7 ; x B = 0.3

Step-by-step solution

P A o = 5 0 0 torr ; P B o = 8 0 0 torr When most of the liquid has vaporized x A = 0.6 (given) would be y A = 0.6 y A = P A o x A P A o x A + P B o 1 - x A ⇒ 0.6 = 5 0 0 . x A 5 0 0 x A + 8 0 0 1 - x A x A = 0.70 ; x B = 0.30

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