Answer
See below
Work Step by Step
The weighted average between these isotopes is:
(6.015121 u)(.07500) + (7.016003 u)(.9250)
Evaluating this gives 6.941 u, which is equal to the given value.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90b: 26
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