Assuming very dilute aqueous solution of urea, calculate the vapour pressure of solution (in mm of Hg) of 0.1 moles of urea in $180 \mathrm{grams}$ of water at ${25}^{\text{o}}\text{C}$ is (The vapour pressure of water at ${25}^{\text{o}}\text{C}$ is 24 mm Hg)