Answer
8.2 x $10^{-4}$
Work Step by Step
The two non zero digits are significant, no zeroes need to be added.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 2 - Section 2.2 - Measured Numbers and Significant Figures - Questions and Problems - Page 30: 2.18d
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