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A certain substance X melts at a temperature of 4.4C. But if a 900.g sample of X is prepared with 62.9g of urea ((NH2)2CO) dissolved

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A certain substance X melts at a temperature of 4.4C. But if a 900.g sample of X is prepared with 62.9g of urea ((NH2)2CO) dissolved in it, the sample is found to have a melting point of 1.8C instead. Calculate the molal freezing point depression constant Kf of X. Round your answer to 2 significant digits

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