What is the freezing point depression constant of a solvent,$50 \ g$ of which contains $1 \ g$ of a non-volatile solute (molar mass $256 \ g \ mol^{-1}$) and the decrease in freezing point is $0.40 \ K$?
- A$5.12 \ K \ kg \ mol^{-1}$
- B$4.43 \ K \ kg \ mol^{-1}$
- C$1.86 \ K \ kg \ mol^{-1}$
- D$3.72 \ K \ kg \ mol^{-1}$
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