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Vapour pressure in mm Hg of 0.1 mole of urea in 180 ~g of water at 25^ C is (The vapour pressure of water at 25^ C is 24 ~mm Hg )

Options

  1. A2.376
  2. B20.76
  3. C23.76
  4. D24.76

Correct answer

C. 23.76

Step-by-step solution

From Raoult's law for very dilute solution. aligned p^ -p_s p^ & = w m M W 24-p_s 24 & =0.1 18 180 24-p_s & =0.24 p_s= & 24-0.24=23.76 ~mm Hg aligned

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