## Chemistry: The Central Science (13th Edition)

Published by Prentice Hall

# Chapter 2 - Atoms, Molecules, and Ions - Exercises: 2.39a

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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