Answer
207.21688
Work Step by Step
To calculate the atomic weight, multiply the atomic masses of the isotopes with their respective relative abudance: $203.97302*.014+205.97444*.241+206.97587*.221+207.97663*.524=207.21688$
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 2 - Atoms, Molecules, and Ions - Additional Exercises - Page 78: 2.95
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