A solution containing 2.5 $\times$ 10^$-$3 kg of a solute dissolved in 75 $\times$ 10^$-$3 kg of water boils at 373.535 K. The molar mass of the solute is ____________ g mol^$-$1. [nearest integer] (Given : K_b(H₂O) = 0.52 K kg mol^$-$1 and boiling point of water = 373.15 K)