#### Answer

D

#### Work Step by Step

We use stoichiometry, making sure that all units cancel out to $\mu g/L$, to find:
$0.02\ \mu g/L \times 1\ g/10^6\mu g=2\times10^{-8}\ \mu g/L$

Published by
Cengage Learning

ISBN 10:
1133949649

ISBN 13:
978-1-13394-964-0

D

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