Answer
A
Work Step by Step
Since they are in the same temperature and $\sqrt{\bar{u^2}}=\sqrt{3RT/M}$, the one with lower molecular weight will be the one with the higher velocity.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 10 Gases and Their Properties - 10-6 The Kinetic-Molecular Theory of Gases - Review & Check for Section 10-6 - Page 396: 2
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