A solution is prepared by dissolving $1.25 \mathrm{g}$ of oil of wintergreen (methyl salicylate) in $99 \mathrm{g}$ of benzene has a boiling point of $80.31° \mathrm{C}$ and ${\mathrm{K}}_{\mathrm{b}}$ for benzene $=2.53 \mathrm{K} \mathrm{Kg} {\mathrm{mol}}^{-1}$. Find the molar mass of the solute. (Boiling point of benzene$=80° \mathrm{C}$)