Answer
We don't know whether or not the gold coin is comprised of only gold.
Work Step by Step
Many coins are made of mixtures of zinc, nickel, and copper, thus making the coin not 100% gold.
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 1 - Introduction: Matter and Measurement - Additional Exercises - Page 37: 1.59b
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