## Chemistry 9th Edition

Published by Cengage Learning

# Chapter 3 - Stoichiometry - Exercises - Page 128: 39

#### Answer

Mass of $^{185}Re$= 185.0 amu

#### Work Step by Step

Let m be the molar mass of $^{185}Re$: $186.207 = 0.6206*186.956+(1-0.6206)m$ $m=\frac{186.207-0.6206*186.956}{(1-0.6206}=185.0$ amu

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