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How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268 ~K ? ( K _ f for water is 1.86 ~K ~kg . mol ⁻¹ )

Options

  1. A880.07 ~g
  2. B899.04 ~g
  3. C886.02 ~g
  4. D868.06 ~g

Correct answer

D. 868.06 ~g

Step-by-step solution

T _f= K _f m where m= molality 273-268=1.86 w M V 5=1.86 w 32 10 w= 5 32 10 1.86 =860.2 868.06 ~g

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