Answer
Endothermic.
Work Step by Step
Since the yellow color is caused by the presence of the monomer, the equilibrium constant increases with temperature, meaning that the dissociation is endothermic.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 15 Principles of Chemical Reactivity: Equilibria - 15-6 Disturbing a Chemical Equilibrium - Applying Chemical Principles - Questions - Page 582: 4
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