Answered: Cholesterol is an important compound in…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 124QRT

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Cholesterol is an important compound in the body, but in excess has been implicated as a cause of heart disease. A solution of 4.82 g of cholesterol in 112 g of benzene (C6H6) has a freezing point of 4.886°C. The freezing point of pure benzene is 5.455°C; the Kf for benzene is 5.12°C /m. What is the molecular weight of cholesterol?

Expert Solution

Step 1

Given data :

Mass of cholestrol = 4.82 gms Mass of Benzene = 112 gms

$T_{f r e e z i n g} (c h o l e s t r o l) = 4.886 ° C T_{f r e e z i n g} (B e n z e n e) = 5.455 ° C$

Kf for benzene = 5.12 $° C / m$

$∆ T_{f} = 5.455 - 4.886 = 0.569$

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