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Vapour pressure of a solution of 5 g of non- electrolyte in 100 g of water at a particular temperature is 2985 N / m 2 . The vapour pressure of pure water is 3000 N / m 2 . The molecular weight of the solute is

Options

  1. A60
  2. B120
  3. C180
  4. D380

Correct answer

C. 180

Step-by-step solution

P o - P s P o = W 2 M 2 W 1 M 1 = 3000 - 2985 3000 = 5 M 2 100 18 or M 2 = 180

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