Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 3 - Sections 3.1-3.12 - Exercises - Conceptual Problems - Page 136: 156c

Answer

Oxygen

Work Step by Step

First, hydrogen is so light that it will not have the largest mass percentage already. This leaves carbon and oxygen with a one to one ratio. This means that oxygen at 16g/mol will be heavier than carbon at 12g/mol.
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