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BITSAT Chemistry Solutions 2023 BITSAT 2023 (Memory Based Paper 1)

BITSAT Chemistry Question (2023) — Solution

Question

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. A. 7.5 ~mol
  2. B. 8.5 ~mol
  3. C. 9.5 ~mol
  4. D. 10.5 ~mol

Answer

A. 7.5 ~mol

Step-by-step solution

7.5 ~mol T_f=K_f m T_f=K_f n_2 1000 w_1 14=1.86 n_2 1000 1000 n_2=7.5 ~mol

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