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A certain substance X has a normal freezing point of 6.8 C and a molal freezing...

A certain substance X has a normal freezing point of 6.8 C and a molal freezing point depression constant Kf=7.51C kg x mol-1 . A solution is prepared by dissolving some urea ((NH2)2CO) in 600 of X. This solution freezes at 5.0 C . Calculate the mass of urea that was dissolved.

Be sure your answer has the correct number of significant digits.

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