9th Edition

ISBN: 9781133949640

Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher: Cengage Learning

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Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to a…

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Textbook Question

Chapter 15.A, Problem 1Q

Freezing point depression is one means of determining the molar mass of a compound. The freezing point depression constant of benzene is −5.12 °C/m.

a. When a 0.503 g sample of the white crystalline dimer is dissolved in 10.0 g benzene, the freezing point of benzene is decreased by 0542 °C. Verify that the molar mass of the dimer is 475 g/mol when determined by freezing point depression. Assume no dissociation of the dimer occurs.
b. The correct molar mass of the dimer is 487 g/mol. Explain why the dissociation equilibrium causes the freezing point depression calculation to yield a lower molar mass for the dimer.

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Chapter 15.6, Problem 3RC

Chapter 15.A, Problem 2Q

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Solution Summary: The author explains that dissociation equilibrium causes the freezing point depression to yield a lower molar mass.

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