Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 11 - Think and Explain: 57

Answer

Hydrogen.

Work Step by Step

$KE = \frac{1}{2}mv^{2}$. If the average KE is the same, the lower-mass H molecules have greater speed than the oxygen molecules.
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