The vapour pressure of $30 \%(\mathrm{w} / \mathrm{v})$ aqueous solution of glucose is $\_\_\_\_$ mm Hg at $25^{\circ} \mathrm{C}$. [Given: The density of $30 \%(\mathrm{w} / \mathrm{v})$, aqueous solution of glucose is $1.2 \mathrm{~g} \mathrm{~cm}^{-3}$ and vapour pressure of pure water is 24 mm Hg .] (Molar mass of glucose is $180 \mathrm{~g} \mathrm{~mol}^{-1}$ )