The purest acetic acid is often called glacial acetic acid because it is purified by fractional freezing at its melting point of 16.6°C. A flask containing several moles of acetic acid at 16.6°C is lowered into an ice-water bath briefly. When it is removed, it is found that exactly 1 mol of acetic acid has frozen. Given: AfusH (CH3CO₂H) = 11.45 kJ mol-¹ and Afus H (H₂O) = 5.98 kJ mol-¹. (a) What is the change in en- tropy of the acetic acid? (b) What is the change in entropy of the water bath? (c) Now consider that the water bath and acetic acid are in the same system. What is the entropy change for the combined system? Is the process reversible or irre-
The purest acetic acid is often called glacial acetic acid because it is purified by fractional freezing at its melting point of 16.6°C. A flask containing several moles of acetic acid at 16.6°C is lowered into an ice-water bath briefly. When it is removed, it is found that exactly 1 mol of acetic acid has frozen. Given: AfusH (CH3CO₂H) = 11.45 kJ mol-¹ and Afus H (H₂O) = 5.98 kJ mol-¹. (a) What is the change in en- tropy of the acetic acid? (b) What is the change in entropy of the water bath? (c) Now consider that the water bath and acetic acid are in the same system. What is the entropy change for the combined system? Is the process reversible or irre-
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.101PAE
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Transcribed Image Text:The purest acetic acid is often called glacial acetic acid
because it is purified by fractional freezing at its melting point
of 16.6°C. A flask containing several moles of acetic acid
at 16.6°C is lowered into an ice-water bath briefly. When
it is removed, it is found that exactly 1 mol of acetic acid
has frozen. Given: AfusH (CH3CO₂H) = 11.45 kJ mol−¹ and
AfusH (H₂O) = 5.98 kJ mol-1. (a) What is the change in en-
tropy of the acetic acid? (b) What is the change in entropy
of the water bath? (c) Now consider that the water bath and
acetic acid are in the same system. What is the entropy change
for the combined system? Is the process reversible or irre-
versible? Why?
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