Conceptual Physics (12th Edition)

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

Chapter 16 - Think and Explain: 56

Answer

On average, hydrogen molecules move faster than oxygen molecules at the same temperature.

Work Step by Step

Having the same temperature means they have the same average translational kinetic energy per molecule. $KE = \frac{1}{2} mv^{2}$. The mass m of a hydrogen molecule is much less than that of an oxygen molecule, so the speed v must be greater to have the same average kinetic energy.
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