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 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.39a

Answer

24.3051 amu

Work Step by Step

To find the average atomic mass we need to find the weighted average of the three isotopes. We do so by taking the sum of mass of each isotope times its abundance as follows: 23.98504amu * 0.7899 + 24.98584amu*0.1000 + 25.98259amu * 0.1101 = 24.3051 amu

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