Chemistry 10th Edition

Published by Brooks/Cole Publishing Co.
ISBN 10: 1133610668
ISBN 13: 978-1-13361-066-3

Chapter 4 - The Structure of Atoms - Exercises - Atomic Composition, Isotopes, and Atomic Weights - Page 165: 29

Answer

Atomic mass of the element = $96.056 amu$

Work Step by Step

Mass of Isotope 1 = $ 94.9 amu$ % abundance of Isotope 1 = $12.4\%$ Mass of Isotope 2 = $95.9 amu$ % abundance of Isotope 2 = $73.6\%$ Mass of Isotope 3 = $97.9amu$ % abundance of Isotope 3 = $14.0\%$ Atomic mass of an element is the weighted average of the masses of the constituent isotopes. Therefore, atomic mass of the element is: Atomic mass of the element = $0.124(94.9 amu) + 0.736(95.9 amu) + 0.14 (97.9 amu)$ Atomic mass of the element = $96.056amu$
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