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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
Solutions

JIPMER 2004 · Chemistry · Solutions

Addition of a non-volatile solute causes lowering in vapour...

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. A0.250.25
  2. B0.750.75
  3. C0.500.50
  4. DCannot be predicted

Correct answer

A. 0.250.25

Step-by-step solution

From Raoult's law, P−PsP=\frac{P-P_s}{P}= mole fraction of solute \left(x_A\right) \therefore \quad x_A=\frac{0.8-0.2}{0.8}=\frac{0.6}{0.8}=0.75Hence,mole−fractionofsolventHence, mole-fraction of solvent=1-0.75=0.25
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