Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 3 Chemical Reactions - 3-9 Classifying Reactions in Aqueous Solution - Applying Chemical Principles - Questions - Page 135: 3


Two 2+ and one 3+.

Work Step by Step

Oxidation numbers: O: -2, Y: +3, Ba: +2 For copper (one is +2): $0= +3+2\times2+2+nOx_{Cu}\times2-2\times7$ $nOx_{Cu}=+5/3\rightarrow wrong$ For copper (two are +2): $0= +3+2\times2+2\times2+nOx_{Cu}-2\times7$ $nOx_{Cu}=+3$
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