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 \( 0.45^{\circ} \mathrm{C} \). The degree of association of acetic acid is (given that \( K_{f} \) for benzene is \( 5.12 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}{ }^{-1} \) )
(A) \( 0.985 \)
(B) \( 0.945 \)
(C) \( 0.845 \)
(D) \( 0.795 \)
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