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Home » The freezing point depression constant of benzene is . The freezing point depression for the solution of molality m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places): (1) (2) (3) (4)
The freezing point depression constant \left(K_{f}\right) 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 upto two decimal places):
(1) 0.80 K (2) 0.40 K (3) 0.60 K (4) 0.20 K
Chemistry
The freezing point depression constant \left(K_{f}\right) 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 upto two decimal places):
(1) 0.80 K (2) 0.40 K (3) 0.60 K (4) 0.20 K

Correct option: (2)

As we know that, we evaluate the value using the formula directly,

\begin{aligned} \Delta T _{ f }= i k _{ f } m \\ \Rightarrow \quad \Delta T _{ f } &=1 \times 5.12 \times 0.078 \\ \Delta T _{ f } &=0.3993 \\ \Delta T _{ f } &=0.40 K \end{aligned}

i

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