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The freezing point depression constant (Kf) of benzene is 5.12 K kg mol⁻¹. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off up to two decimal places):

1. 0.80K
2. 0.40K
3. 0.60K
4. 0.20K

Correct answer: 0.40K

Solution

The freezing point depression (ΔTf) is calculated using the formula ΔTf = Kf × m. Substituting the given values, ΔTf = 5.12 × 0.078 = 0.39936 ≈ 0.40 K.

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