AP EAMCET Medical 24 Apr 2019 Shift 2 Paper

2.5 g of phenol (molar mass 94 g mol−1) dissolved in 200 g of benzene shows a depression in freezing point equal to 0.512 K. What is the percentage of association of phenol if it forms a dimer in solution?
(Kf of benzene = 5.12 K kg mol−1)