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If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is ____ molal.
[$K_b = 0.52$ K kg mol$^{-1}$]
$i = 1 + (2-1)(3/4) = 7/4$. $m = 2.5/(0.52 \times 7/4) = 2.747 \simeq 3$ mol/kg.
BETA
