$2 \text{ g}$ of a non-electrolyte solute, when dissolved in $50 \text{ g}$ of water, increases its boiling point by $0.13 \text{ K}$. Calculate the molar mass of the solute if the molal elevation constant $(K_b)$ of water is $0.52 \text{ K kg mol}^{-1}$.
- A$140 \text{ g mol}^{-1}$
- B$150 \text{ g mol}^{-1}$
- C$160 \text{ g mol}^{-1}$
- D$170 \text{ g mol}^{-1}$
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