Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 21 - Electrochemistry - 21 Assessment: 27

Answer

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Work Step by Step

Because aluminum is more active than copper, aluminum is more readily oxidized and a reaction spontaneously occurs. We should notice that the number of electrons transferred in the half-reactions is not the same and cannot cancel each other, so we multiply the oxidation half-reaction by 2 and the reduction reaction by 3.
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