Q.

At 1000C the vapour pressure of a solution of 6.5 gm of a solute in 100 gm of water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

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a

102oC

b

103oC

c

101oC

d

1000C

answer is C.

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Detailed Solution

At 100oc                           GMW of H2O=18g           Kb(H2O)= 0.52KKgmole-1(I)     Assuming the solution is very dilute      m=2.05m(II)                         Tb(solution)-100=1.06             Tb(solution) = 101.060C
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At 1000C the vapour pressure of a solution of 6.5 gm of a solute in 100 gm of water is 732 mm. If Kb = 0.52, the boiling point of this solution will be