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Coolant used in car radiator is aqueous solution of ethylene glycol. In order to prevent the solution from freezing at -0.3^ C . How much ethylene glycol must be added to 5 ~kg of water ? ( K _ f =1.86 ~K Kg mol ⁻¹ )

Options

  1. A50 ~g
  2. B55 ~g
  3. C45 ~g
  4. D40 ~g

Correct answer

A. 50 ~g

Step-by-step solution

T _ f =0.3^ C array l T _ f = K _ f W _ B 1000 M _ B W _ A 0.3= 1.86 W _ B 1000 62 5000 array W _ B =50 ~g The amount used should be more than 50 ~g .

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