18 g of glucose is dissolved in 1 kg of water in a beaker. At what temperature will water boil at 1.013 bar? (Kb for water is 0.52 K kg mol-1 )
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Number of moles of glucose = 18/180 = 0.1 mol.
Mass of solvent = 1 kg.
Morality of glucose , m = \(\frac{n_8}{W_A}\)
= \(\frac{0.1\,mol}{1\,kg}\)
= 0.1 mol/Kg
Elevation of boiling point ΔTb = Kb × m
= 0.52 K kg/mol × 0.1 mol/kg = 0.052 K
Since water boils at 373.15 K at 1.013 bar pressure, the boiling point of solution will be
373.15 K + 0.052 K = 373.202 K