Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 76: 2.52c


9 hydrogen atoms.

Work Step by Step

(NH$_{4}$)$_{2}$HPO$_{4}$ has 9 hydrogen atoms because NH$_{4}$ has 4 hydrogen molecules and there are 2 NH$_{4}$ molecules in this compound, so 2$\times$4=8. There is also 1 hydrogen atom in HPO$_{4}$, so 8+1=9.
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