Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 3 - Mass Relationships in Chemical Reactions - Questions & Problems: 3.128


Yes, 1 gram of hydrogen molecules contains as many atoms as 1 gram of hydrogen atoms.

Work Step by Step

Whether there is 1 gram of H molecules or 1 gram of H atoms, hydrogen is the only element present in both cases. Because hydrogen has a set molar mass, as do all elements, 1 gram of hydrogen will always be 1 gram of hydrogen. If you compare 1 gram of H atoms and 1 gram of H$_2$ molecules, there will be half as many H$_2$ molecules, since there are two H atoms per molecule. However, the number of atoms is the same.
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