## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# 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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