Answer
-1
Work Step by Step
$K_2O_2$
From the periodic table, $K$ is +1. Since the overall charge must be 0 then we have:
$2K+2O=0$
$2(1)+2O=0$
$2+2O=0$
$2O=-2$
$O=-1$
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 4 - Reactions in Aqueous Solution - Exercises - Page 159: 4.49f
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