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

Answered: A certain substance X melts at a…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.95QE

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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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