Solutions and Colligative Properties - Result Question 55

####26. Two liquids A and B form ideal solution. At 300K, the vapour pressure of a solution containing 1 mole of A and 3 moles of B is 550mm of Hg. At the same temperature, if one more mole of B is added to this solution, the vapour pressure of the solution increases by 10mm of Hg. Determine the vapour pressure of A and B in their pure states.

(1982,4M)

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Solution:

  1. When 1.0 mole of A is mixed with 3 moles of B.

550=0.25pA+0.75pB

When 1.0 mole of A is mixed with 4 moles of B.

560=0.20pA+0.80pB

Now, solving (i) and (ii) pA=400mm

pB=600mm.



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