A solution is prepared by dissolving 0.6 g of urea (molar mass $=60 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and 1.8 g of glucose (molar mass $\left.=180 \mathrm{~g} \mathrm{~mol}^{-1}\right)$ in 100 mL of water at $27^{\circ} \mathrm{C}$. The osmotic pressure of the solution is $\left(\mathrm{R}=0.08206 \mathrm{~L} \mathrm{~atm} \mathrm{~K}_{-1} \mathrm{~mol}^{-1}\right)$