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

 XY2X2++2YInitially 1 0 0 at equilibrium 1α α 2α
Total no. of moles = 1α+α+2α=1+2α
i= Normal molar mass  Observed molar mass ; 1+2α1=16465.6 α=0.75;%α=75%

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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: