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The aqueous solution of urea has freezin...

The aqueous solution of urea has freezing point `-0.6^(@)C`. To prepare such solution how much gram of urea is needed to dissolve in 3 kg of water ? (M = 60 gm/mol) `(K_(f)=1.5^(@)C" kg mol"^(-1))`.

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The correct Answer is:
72 gm
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