Solutions and Colligative Properties - Result Question 56

####27. The vapour pressure of pure benzene is 639.70mm of Hg and the vapour pressure of solution of a solute in benzene at the same temperature is 631.9mm of Hg. Calculate the molality of the solution.

(1981, 3M)

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Solution:

  1. According to Raoult’s law :

p=p0χ1631.9=639.7χ1 χ1=0.9878χ2=0.0122  Molality =0.01220.9878×78×1000=0.158



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