$A$ solution of non-volatile solute has boiling point elevation $0.5 \ K$. Calculate molality of solution $[K_{b} = 2.40 \ K \ kg \ mol^{-1}]$.
- A$0.12 \ mol \ kg^{-1}$
- B$0.21 \ mol \ kg^{-1}$
- C$0.16 \ mol \ kg^{-1}$
- D$0.28 \ mol \ kg^{-1}$
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