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A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 ~mm at 300 ~K . The vapour pressure of propyl alcohol is 200 ~mm . If the mole fraction of ethyl alcohol is 0.6 , its vapour pressure (in mm ) at the same temperature will be

Options

  1. A350
  2. B300
  3. C700
  4. D360

Correct answer

A. 350

Step-by-step solution

Let the vapour pressure of pure ethyl alcohol be P , According to Raoult's law aligned & 290=200 0.4+ P 0.6 & P = 290-80 0.6 =350 ~mm ~Hg aligned Hence, (A) is correct.

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