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 - Problems by Topic - Page 130: 23d

Answer

1 Calcium (Ca) atom 2 Oxygen (O) atoms 2 Hydrogen (H) atoms

Work Step by Step

In the formula $Ca(OH)_{2}$, there is only 1 calcium atom because there is no subscript beside "Ca" indicating that there is only one of that atom. Although oxygen and hydrogen have no subscript beside them they are both in a bracket which has a subscript of 2, indicating that there are 2 oxygen atoms and 2 hydrogen atoms.
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