General Chemistry (4th Edition)

Published by University Science Books
ISBN 10: 1891389602
ISBN 13: 978-1-89138-960-3

Chapter 2 Atoms and Molecules - Problems - Page 75: 52


First row solution: $\text{isotopic mass}(^{70}\text{Ga})=68.925462$ Second row solution: $0.39892$

Work Step by Step

The average atomic mass of Gallium is $69.723$, so \begin{align*}69.723&=\text{isotopic mass}(^{70}\text{Ga})\cdot 0.60108+70.9247050\cdot (1-0.60108)\\ &\Longrightarrow \text{isotopic mass}(^{70}\text{Ga})=\frac{69.723-70.9247050\cdot (1-0.60108)}{0.60108}\\ &=68.925462\end{align*} Second row solution: $ 1 - 0.60108= 0.39892$
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