A certain substance X melts at a temperature of 7.6 °C. But if a 750. g sample of X is prepared with 30.54 g of urea ((NH₂)₂CO)

Question

A certain substance X melts at a temperature of 7.6 °C. But if a 750. g sample of X is prepared with 30.54 g of urea ((NH₂)₂CO) dissolved in it, the sample is found to have a melting point of 2.8 °C instead. Calculate the molal freezing point depression constant KF of X. 
Round your answer to 2 significant digits.

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