The molal freezing point depression constant =Kf·7.96°C·kgmol−1 for a certain substance X. When 5.40g of urea NH22CO are dissolved in 200.g of X, the solution freezes at −4.9°C. Calculate the freezing point of pure X.

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Chapter13: Solutions And Their Behavior
Section13.4: Colligative Properties
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The molal freezing point depression constant =Kf·7.96°C·kgmol−1 for a certain substance X. When 5.40g of urea NH22CO are dissolved in 200.g of X, the solution freezes at −4.9°C. Calculate the freezing point of pure X.

Round your answer to 2 significant digits.

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