A solution containing 2 . 5 × 10 ^ - 3 kg of a solute dissolved in...

${\Delta T}_{b} = {iK}_{b}m$

${\Delta T}_{b} = Elevationofboilingpoint{K}_{b} = molalboilingpointelevationconstantm = molalityi = van ' thofffactor$

$m = \dfrac{2 . 5}{M} \times \dfrac{1000}{75}$

$∆ {T}_{b} = {T}_{b} - {T}_{b}^{o}{T}_{b} = Boilingpointofthesolution{T}_{b}^{o} = Boilingpointofthesolvent ∆ {T}_{b} = 373 . 535 - 373 . 15 = 0 . 385K$

${\Delta T}_{b} = {iK}_{b}m$

$0 . 385 = 1 \times 0 . 52 \times \dfrac{2 . 5 \times 1000}{M \times 75}$

The molar mass of the solute,$M = 45g / ml$.