Conceptual Physics (12th Edition)

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

Chapter 16 - Think and Discuss: 88

Answer

The species of gas molecules are mixed, which means they have the same temperature. This means they have the same average translational kinetic energy per molecule. $KE = \frac{1}{2} mv^{2}$. The lighter molecules (e.g., hydrogen) must have a higher average speed than heavier molecules (e.g., carbon dioxide) to have the same average kinetic energy per molecule.
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