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The freezing point of pure nirobenzene i...

The freezing point of pure nirobenzene is 278.8 K. When 2.5 g of an unknown substance is dissoved in 100 g of introbenzene, the freezing point of the solution is found to be 276.8 K. If the freezing point depression of nitrobenzene is `8.0 K kg mol^(-01)`, What is the molar of the unknow substance ?

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