Answer
There are $9.97 \times 10^{-15}$ moles of $Co$ in 6 billion atoms of $Co$.
Work Step by Step
Using Avogadro's number, we find:
$6.00 \times 10^9 atoms \times \frac{1 mole}{6.022 \times 10^{23} atoms} = 9.97 \times 10^{-15}$ moles.
Chemistry (4th Edition)
by Burdge, Julia
Published by
McGraw-Hill Publishing Company
ISBN 10:
0078021529
ISBN 13:
978-0-07802-152-7
Chapter 3 - Questions and Problems - Page 120: 3.35
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