A solution containing \( 2.5 \times 10^{-3} \, \mathrm{kg} \) of a solute dissolved in \( 75 \times 10^{-3} \, \mathrm{kg} \) of water boils at \( 373..535 \, \mathrm{K} \). The molar mass of the solute is _______ \( \mathrm{g\,mol^{-1}} \). [nearest integer]
\( \left( \text{Given : } K_b\,(\mathrm{H_2O}) = 0.52 \, \mathrm{K\,mol^{-1}} \text{ and boiling point of water } = 373.15 \, \mathrm{K} \right) \)
