## Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning

# Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Exercises - Page 84: 2.45

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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