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How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at 14^ C ? ( K _ f . for water .=1.86^ C / mol )

Options

  1. A7.5 ~mol
  2. B8.5 ~mol
  3. C9.5 ~mol
  4. D10.5 ~mol

Correct answer

A. 7.5 ~mol

Step-by-step solution

7.5 ~mol T_f=K_f m T_f=K_f n₂ 1000 w₁ 14=1.86 n₂ 1000 1000 n₂=7.5 ~mol

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