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The unknown solution is composed of 50.0 g of nitrobenzene and 5.00 mL of the liquid unknown. Freezing point for nitrobenzene is 5.20 degrees C. Density of the unknown is 0.714 g mL^-1. And the Kf of nitrobenzene is 6.87 degrees C Kg mol^-1. Determine the freezing point of the unknown substance.

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