Answer
The reaction is spontaneous above 250K.
Work Step by Step
A reaction is spontaneous when $\Delta$G is negative, which is shown to occur at T > 250K by the graph.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 19 - Chemical Thermodynamics - Exercises - Page 846: 19.8b
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