Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 18 - A Macroscopic Description of Matter - Stop to Think 18.2 - Page 494: 1

Answer

B. Oxygen

Work Step by Step

Oxygen is a diatomic gas, so 1 mole of oxygen gas contains 2 moles of oxygen atoms (about $12.04\times 10^{23}$ atoms). On the other hand, there is only 1 mole helium atoms in 1 mole of helium gas because helium is monatomic.
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