Chemistry - Liquid Solution Question with Solution | TestHub

Molecules of benzoic acid$\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}\right)$dimerise in$30\mathrm{g}$of benzene. '$\mathrm{w}$'$\mathrm{g}$of benzoic acid shows a depression in freezing point equal to$\mathrm{2 }\mathrm{K}$. If the percentage association of the acid to form dimer in the solution is$80$, then$\mathrm{w}$is:$($Given that${\mathrm{K}}_{\mathrm{f}}=5 {\mathrm{Kmol}}^{-1}$, molar mass of benzoic acid$=\mathrm{122 }{\mathrm{gmol}}^{-1})$