GKFix MCQ Question

What is the formula for calculating the molal freezing point depression constant (Kf)?

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