GKFix MCQ Question

What is the formula for calculating Kb?

• A. Kb = (R × M1 × Tb² × 1000) / ΔvapH
• B. Kb = (R × M1 × Tf² × 1000) / ΔfusH
• C. Kb = (R × M2 × Tb² × 1000) / ΔvapH
• D. Kb = (R × M1 × Tb × 1000) / ΔfusH