Suppose that you add 20.9 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.12 oC compared to pure benzene. What is the molar mass of the unknown compound? Type answer:

Suppose that you add 20.9 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.12 oC compared to pure benzene. What is the molar mass of the unknown compound? Type answer:

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter10: Solutions

Section: Chapter Questions

Problem 48QAP: The Rast method uses camphor (C10H16O) as a solvent for determining the molar mass of a compound....

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Concept explainers

Solutions

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 as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

Suppose that you add 20.9 g of an unknown molecular compound to 0.250 kg of benzene, which has a Kf of 5.12 ^oC/m. With the added solute, you find that there is a freezing point depression of 3.12 ^oC compared to pure benzene.

What is the molar mass of the unknown compound?

Type answer:

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