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 77: 2.62b



Work Step by Step

The iron ion has a net 3+ charge and the oxygen ion has a net 2- charge. If you have 2 iron atoms, the positive charge becomes 6+, if you have 3 oxygen atoms, the negative charge becomes 6-. You can see that the two charges balance out to a net charge of 0. This means that the chemical formula is Fe$_{2}$O$_{3}$.
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