Answer
See answer below.
Work Step by Step
From the data given, we have
$23.985042\times\frac{78.99}{100}+24.985837\times\frac{10.00}{100}+25.982593\times\frac{11.01}{100}=24.31\ u$
Which is the value claimed to be the atomic weight of magnesium.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95a: 22
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