Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 2 - Sections 2.1-2.9 - Exercises - Conceptual Problems - Page 84: 132

Answer

The answer is C

Work Step by Step

Since we can't do any calculation, we must think logically about the question. Since the natural abundance of Li-7 is 92.5 % and the natural abundance of Li-6 is only 7.5%, the atomic mass will pull closer to 7.00 amu since a majority of the atoms has a mass of 7.00 amu.
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