Answer
21.427 has 5 significant digits.
Work Step by Step
Reading from left to right, each non-zero digit and each digit containing an embedded zero are counted as significant digits.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 1 - Introduction: Matter and Measurement - Exercises - Page 36: 1.43
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