A solute A dimerizes in water. The boiling point of a \( 2 \) molal solution of A is \( 100.52^\circ \mathrm{C} \). The percentage association of A is ______
[Use: \( K_b \) for water \( = 0.52 \, \mathrm{K\,kg\,mol^{-1}} \) Boiling point of water \( = 100^\circ \mathrm{C} \)]
