If a 1 m solution of benzoic acid in benzene | vedclass

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Question

(A) For freezing point: Theoretical $\Delta T_f = K_f 	imes m = 5.12 	imes 1 = 5.12 \ ^{\circ}C$.
Observed $\Delta T_f = 2.56 \ ^{\circ}C$.
Since

Vedclass · Accepted Answer

$I, II$

Vedclass · Answer

(A) For freezing point: Theoretical $\Delta T_f = K_f 	imes m = 5.12 	imes 1 = 5.12 \ ^{\circ}C$.
Observed $\Delta T_f = 2.56 \ ^{\circ}C$.
Since observed $\Delta T_f < $ theoretical $\Delta T_f$,the van't Hoff factor $i = \frac{2.56}{5.12} = 0.5$,which indicates dimer formation.
For boiling point: Theoretical $\Delta T_b = K_b 	imes m = 2.53 	imes 1 = 2.53 \ ^{\circ}C$.
Observed $\Delta T_b = 2.53 \ ^{\circ}C$.
Since observed $\Delta T_b =$ theoretical $\Delta T_b$,$i = 1$,indicating no association or dissociation.
Thus,Statement $I$ and Statement $II$ are correct.

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