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CGP EDU Academic Team
Published on: August 14, 2026
Calculate the percentage degree of dissociation of an electrolyte XY 2 (Normal molar mass = 164) in water if the observed molar mass by measuring elevation in boiling point is 65.6.
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75%
XY 2 
X 2+ + 2Y –
Initially 1 0 0
at equilibrium 1 – α α 2 α
Total no. of moles = 1 – α + α + 2 α = 1 + 2 α
i = 
; 
= 
∴ α = 0.75; % α = 75%.
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