Calculate the molal elevation constant $(K_b)$ of a solvent if the boiling point of a $0.12 \ m$ solution is $319.8 \ K$ (Boiling point of pure solvent = $319.5 \ K$).
- A$2.0 \ K \ kg \ mol^{-1}$
- B$3.0 \ K \ kg \ mol^{-1}$
- C$2.5 \ K \ kg \ mol^{-1}$
- D$3.5 \ K \ kg \ mol^{-1}$
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