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When 20g of naphthoic acid (C(11)H(8)O(2...

When 20g of naphthoic acid `(C_(11)H_(8)O_(2))` is dissolved in 50g of benzene `(K_(f) = 1.72 K kg mol^(-1))`. Van't Hoff factor (i) is 0.5. What is the depression in freezing point in `""^(@)K`.

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