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  4. 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 upto two decimal places):

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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 upto two decimal places):

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Solution:

$\Delta\,T_{f}=iK_{f}m$
As solute is non-electrolyte, $i = 1$
$\Delta\,T_{f}=1\times 5.12\times 0.078$
$=0.40\,K$