General, Organic, and Biological Chemistry: Structures of Life (5th Edition)

Published by Pearson
ISBN 10: 0321967461
ISBN 13: 978-0-32196-746-6

Chapter 4 - Atoms - Challenge Questions - Page 148: 4.128

Answer

121.8 amu

Work Step by Step

Sb-121= 120.90 amu, 57.21%; Sb-123= 122.90 amu, 42.79% Formula: (Mass of isotope 1 x %abundance/100%)+(Mass of isotope 2 x %abundance/100%) (120.90amu×0.5721)+(122.90amu×0.4279)= 121.7558 amu Rounded to four significant figures = 121.8 amu, which checks out against the Periodic Table for Antimony (Sb).
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