A solute a dimerizes in water.


A solute a dimerizes in water. The boiling point of a 2 molar solution of $\mathrm{A}$ is $100.52^{\circ} \mathrm{C}$. The percentage association of $A$ is_______.

(Round off to the Nearest integer)

[Use: $\mathrm{K}_{\mathrm{b}}$ for water $=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$

Boiling point of water $=100^{\circ} \mathrm{C}$ ]


$\Delta \mathrm{T}_{\mathrm{b}}=\mathrm{T}_{\mathrm{b}}-\mathrm{T}_{\mathrm{b}}{ }^{0}$


$=0.52^{\circ} \mathrm{C}$


$\because \Delta \mathrm{T}_{\mathrm{b}}=\mathrm{i} \mathrm{K}_{\mathrm{b}} \times \mathrm{m}$

$0.52=\left(1-\frac{\alpha}{2}\right) \times 0.52 \times 2$


So, percentage association $=100 \%$.

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