Practice question
Question
A solution is made by dissolving a non-volatile solute in 900 g of water. If the freezing point decreases by 0.93°C and Kf = 1.86 K kg mol⁻¹ , what is the molality of the solution?
Explanation
Δ Tf = Kf · m . 0.93 = 1.86 · m . m = (0.93/1.86) = 0.5 mol/kg .
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