The freezing point of a solution containing \( 0.2 \mathrm{~g} \) of acetic acid in \( 20.0 \mat...

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The freezing point of a solution containing \( 0.2 \mathrm{~g} \) of acetic acid in \( 20.0 \mathrm{~g} \) benzene is lowered by \( 0.45^{\circ} \mathrm{C} \). Calculate the degree of dimerization of acetic acid in benzene. \( K_{f} \) for benzene is \( 5.12 \) \( \mathrm{K} \mathrm{mol}^{-1} \mathrm{~kg} \) :
(a) \( 0.527 \)
(b) \( 0.80 \)
(c) \( 0.945 \)
(d) None of these
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