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You need to pay attention to the energy change due to the change in gravitational potential energy, for this is the reason that the balloon is getting cold.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 4 - Energy and Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 189a: 18c
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