Answer
See answer below.
Work Step by Step
From the data given, we have:
$6.015121u\times\frac{7.50}{100}+7.016003u\times\frac{92.50}{100}=6.94u$
Which is the value claimed to be the atomic weight of lithium.
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: 21
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