$\text{0}\text{.15}\text{g}$ of a substance dissolved in $\text{15}\text{g}$ of solvent boiled at a temperature higher by $0.216^{\mathrm{o}}\mathrm{C}$ than that of the pure solvent. The molecular weight of the substance is [Given: Molal elevation constant for the solvent is $\text{2}\text{.16}\text{Kkg}{\text{mol}}^{-\text{1}}$]