A certain substance X melts at a temperature of 7.4 °C. But if a 350. g sample of X is prepared with 16. g of ureafound to have a melting point of 5.6 °C instead. Calculate the molal freezing point depression constant K of X.Be sure your answer has the correct number of significant digits.-1°C mol• kgx10X((NH₂)₂CO) dissolved in it, the sample is

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A certain substance X melts at a temperature of 7.4 °C. But if a 350. g sample of X is prepared with 16. g of urea
found to have a melting point of 5.6 °C instead. Calculate the molal freezing point depression constant K of X.
Be sure your answer has the correct number of significant digits.
-1
°C mol
• kg
x10
X
((NH₂)₂CO) dissolved in it, the sample is

Expert Solution

Step 1

To calculate the molal freezing point depression constant Kƒ of substance X, we first need to calculate the freezing point depression ΔTf caused by adding 16 g of urea to 350 g of X.

ΔTf = Kf·m·i

where Kf is the molal freezing point depression constant, m is the molality of the urea solution, and i is the van't Hoff factor, which is the number of particles into which the solute dissociates in the solution.

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