Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 4 - Atomic Structure - 4 Assessment: 67

Answer

14.007 amu

Work Step by Step

To calculate the average atomic mass we add the products of the relative abundance and the mass of each isotope together. Isotope 1: mass= 14.003 amu (99.63%) Isotope 2: mass= 15.000 amu (0.37%) = 14.003 amu (99.63%) + 15.000 amu (0.37%) = 14.003 amu (0.9963) + 15.000 amu (0.0037) = 14.007 amu
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