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MHT CET202122 Sep 2021Morning ShiftChemistrySolutionsActual

The vapour pressure of a solvent decrease by 2.5 ~mm Hg by adding a solute. What is the mole fraction of solute? (Vapour pressure of pure solvent is 250 ~mm Hg )

Options

  1. A0.88
  2. B0.01
  3. C0.1
  4. D0.99

Correct answer

B. 0.01

Step-by-step solution

aligned & P ^ - P _ S P ^0 = X _ solute & P ^ - P _ S =2.5 ~mm , P ^ =250 ~mm & 2.5 250 = X _ solute & X _ solute =0.01 aligned

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