Answer
42 Pennies
Work Step by Step
We know that 1 penny contains 2.4% of the desired weight of copper, so:
$$ \frac {1}{.024}=42 \ Pennies$$
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90d: 78a
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