What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol − 1 ) and the decrease in freezing point is 0.40 K ?

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Δ T f ​ 0.4 K b ​ ​ = K b ​ ⋅ m = K b ​ 50 × 1 0 − 3 256 1 ​ ​ = 5.12 K kg / mol ​

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