Mass of Urea $\left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right)$ required to be dissolved in $1000 \mathrm{~g}$ of water in order to reduce the vapour pressure of water by $25 \%$ is _________ g. (Nearest integer)

Given: Molar mass of N, C, O and H are $14,12,16$ and $1 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively