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When dissolved in benzene, a compound C(...

When dissolved in benzene, a compound `C_(38)H_(30)` partilly dissociates by the following equation:

`25.6 g` of `C_(38)H_(30)` is dissolved in `400 g` of benzene, the freezing point is lowered by `0.680^(@)C`. What percentage of `C_(38)H_(30)` molecules have dissociated? `(K_(f)=4.9)`

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