Practice question
Question
A solution is made by dissolving 15 g of a solute (molar mass = 30 g/mol) in water. If the boiling point elevation is 0.26°C and Kb = 0.52 K kg mol⁻¹ , what is the mass of water?
Explanation
Moles = (15/30) = 0.5 . Δ Tb = Kb · m . 0.26 = 0.52 × (0.5/w) , w = (0.5 × 0.52/0.26) = 1 kg = 1000 g .
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