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Q.

Calculate the percentage degree of dissociation of an electrolyte XY2 (Normal molar mass = 164) in water if the observed molar mass by measuring elevation in boiling point is 65.6:

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a

75%

b

25%

c

65%

d

None of these

answer is A.

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Detailed Solution

XY2⇌X2++2Y−Initially 1 0 0 at equilibrium 1−α α 2αTotal no. of moles = 1−α+α+2α=1+2αi= Normal molar mass  Observed molar mass ; 1+2α1=16465.6∴ α=0.75;%α=75%
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