Give the formula for the boiling point elevation constant $(K_b)$.
- A$K_b = \frac{R \times M_1 \times T_b^2}{1000 \times \Delta_{vap}H}$
- B$K_b = \frac{R \times M_1 \times T_b}{1000 \times \Delta_{vap}H}$
- C$K_b = \frac{R \times T_b^2}{1000 \times \Delta_{vap}H}$
- D$K_b = \frac{M_1 \times T_b^2}{1000 \times \Delta_{vap}H}$
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