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Addition of a non-volatile solute causes lowering in vapour pressure of a solvent from 0.8 atm to 0.2 atm. What is the mole fraction of solvent?

Options

  1. A0.25
  2. B0.75
  3. C0.50
  4. DCannot be predicted

Correct answer

A. 0.25

Step-by-step solution

From Raoult's law, P-P_s P = mole fraction of solute (x_A ) x_A= 0.8-0.2 0.8 = 0.6 0.8 =0.75 Hence, mole-fraction of solvent =1-0.75=0.25

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