Answer
Please see the work below.
Work Step by Step
We know that
$69.72=n\times 69+(1-n)\times 71$
$69.72=69n+71-71n$
$-2n=-1.28$
$n=\frac{-1.28}{-2}=0.64$
$n=0.64\times \frac{100}{100}=64\%$
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 2 - Atoms, Molecules, and Ions - Questions and Problems - Page 79: 2.22
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