Answer
21%
Work Step by Step
About 21% of Earth’s atmosphere is composed of $O_{2}$.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 22 - Sections 22.1-22.9 - Exercises - Review Questions - Page 1069: 13
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