#### Answer

99.987%.

#### Work Step by Step

From a total of 7.748mg of Hg, 7.747 were filtered.
$\frac{7.748}{7.747}$ = $\frac{100}{x}$
7.748x = 7.747 $\times$ 100
7.748x = 774.7
x = $\frac{774.7}{7.748}$
x = 99.987

Published by
Prentice Hall

ISBN 10:
0321910419

ISBN 13:
978-0-32191-041-7

99.987%.

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