Answer
Please see the work below.
Work Step by Step
We calculate the average atomic mass as
Natural Chlorine $35.45271\times \frac{1}{2}=17.7263500$
Chlorine 35 $35.00335\times \frac{1}{2}=17.4844250$
Average mass =35.2107750
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 2 - Atoms, Molecules, and Ions - Questions and Problems - Page 86: 2.130
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