Answer
Curve B is helium.
Work Step by Step
Helium is lighter than oxygen, therefore with equal kinetic energy it will have a higher average molecular speed.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 10 - Gases - Exercises - Page 433: 10.9a
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