Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 24 - Problems: 24.70

Answer

See explanation below.

Work Step by Step

Oxygen present in formaldehyde comes from methanol. This can be showed by the oxygen isotope in the methanol appears in the formaldehyde product. The oxygen isotope in the chromic acid reactant appears in the water but not in the formaldehyde product. The isotope traces the oxygen in methanol to the oxygen in formaldehyde.
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