The freezing point depression constant () of benzene is 5.12 K kg . 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) [2020]

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Solution

Q.
The freezing point depression constant ( $K_{f}$ ) 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) [2020]

1 0.20 K

2 0.80 K

3 0.40 K

4 0.60 K

Ans.
(3)

Given: $K_{f} = 5.12$ $K$ $kg$ ${mol}^{- 1}, m = 0.078$ $m$

$Δ T_{f} = K_{f} \times m = 5.12 \times 0.078 = 0.39936 \approx 0.40$ $K$

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