The molality of a solution containing $15.20 \ g$ of urea (molar mass = $60 \ g \ mol^{-1}$) dissolved in $150 \ g$ of water is:
- A$1.689 \ mol \ kg^{-1}$
- B$0.1689 \ mol \ kg^{-1}$
- C$0.5922 \ mol \ kg^{-1}$
- D$0.2533 \ mol \ kg^{-1}$
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