Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - 2-10 Chemical Analysis: Determining Compound Formulas - Applying Chemical Principles - Questions - Page 92: 3


The abundance of $Ar^{40}$ is $99.6\%$ The atomic weight of $Ar^{40}$ is $39.9627\ u$

Work Step by Step

Since these three are the only stable isotopes, the abundance of $Ar^{40}$ is the complement of the others: $100\% -0.337\%-0.063\%=99.6\%$ Argon's atomic weight is 39.948 u, which is the sum of the products of the isotopes' atomic masses by their abundances: $39.948= 35.967545\times0.337/100+37.96732\times0.063/100+x\times99.6/100$ So the atomic weight of $Ar^{40}$ is : $x=39.9627\ u$
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