Calculate the molality of a solution of a non-volatile solute if the boiling point of the solution and the molal elevation constant for the solvent are $319.8 \text{ K}$ and $2.5 \text{ K kg mol}^{-1}$ respectively. [Boiling point of pure solvent $= 319.5 \text{ K}$]
- A$0.12 \text{ mol kg}^{-1}$
- B$0.14 \text{ mol kg}^{-1}$
- C$0.17 \text{ mol kg}^{-1}$
- D$0.21 \text{ mol kg}^{-1}$
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