## Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning

# Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90d: 78a

42 Pennies

#### Work Step by Step

We know that 1 penny contains 2.4% of the desired weight of copper, so: $$\frac {1}{.024}=42 \ Pennies$$

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