What is the value of $K_{f}$ if $30 \ g$ urea (molar mass $60$) dissolved in $0.5 \ dm^{3}$ of water decreases the freezing point by $0.15^{\circ}C$?
- A$0.15 \ K \ kg \ mol^{-1}$
- B$0.030 \ K \ kg \ mol^{-1}$
- C$0.30 \ K \ kg \ mol^{-1}$
- D$0.015 \ K \ kg \ mol^{-1}$
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