Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 3 - Stoichiometry - Exercises - Page 128: 44


The average atomic mass of iron is 56 amu. The lack of precision compared to the textbook value of is due to only two significant figures with the masses of each isotope.

Work Step by Step

Average Atomic Mass = $0.0585*54+0.9175*56+0.0212*57+0.0028*58=56$ amu
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