Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning
ISBN 10: 0534420125
ISBN 13: 978-0-53442-012-3

Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises: 2.45

Answer

85.47 u

Work Step by Step

Atomic mass of Rb = $(\frac{72.17}{100}\times84.912u)+(\frac{100-72.17}{100}\times86.909u)$= 85.47u. Here, 100 is an exact number and it doesn't limit the number of significant figures.
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