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.
Chemistry: Principles and Practice (3rd Edition)
by Reger, Daniel L.; Goode, Scott R.; Ball, David W.
Published by
Cengage Learning
ISBN 10:
0534420125
ISBN 13:
978-0-53442-012-3
Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 84: 2.45
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