Chemistry 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078021510
ISBN 13: 978-0-07802-151-0

Chapter 3 - Mass Relationships in Chemical Reactions - Questions & Problems - Page 107: 3.4


To calculate the average atomic mass of an element, the exact atomic mass of each of the isotopes of that element, and the isotopic abundances would have to be given. You would then take the weighted average of the different isotopes based on the abundance percentages.

Work Step by Step

Average atomic masses are an average of all the atomic masses of the isotopes of an element, so a weighted average of the atomic masses of the different isotopes must be taken with respect to their abundances in nature.
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