Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.36

Answer

85.4681 amu

Work Step by Step

To find the atomic weight (the average atomic weight), we need to take the weighted average of the two isotopes. To do this we take the sum of each isotopes mass in amu * each isotopes abundance as follows: 84.9118amu * 0.7215 + 86.9092amu * 0.2785 = 85.4681 amu
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