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$O_2$ is the natural form of Oxygen, for it is a diatomic molecule. Thus, the enthalpy of formation is 0.
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 - Review Questions - Page 189a: 4b
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