University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 18 - Thermal Properties of Matter - Problems - Discussion Questions - Page 609: Q18.18

Answer

The hydrogen and helium molecules move faster than oxygen molecules do.

Work Step by Step

The average speed of a gas molecule is inversely proportional to the square root of its mass, as discussed on page 604. The lighter hydrogen and helium molecules move faster than oxygen molecules do. Each second, more H/He atoms strike the area of the hole, escape the container, and lower the pressure faster than if the tank contained oxygen.
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