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: 2.62c



Work Step by Step

Hg$_{2} ^{2+}$ has a 2+ charge, and CO$_{3}^{2-}$ has a 2- charge. You can see that the two balance each other out to create a neutral compound. Therefore you need one Hg$_{2} ^{2+}$ and one CO$_{3}^{2-}$ to get a compound with a net 0 charge, and the chemical formula must be Hg$_{2}$CO$_{3}$.
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