Answer
SO$_3$ is nonpolar.
Work Step by Step
Oxygen is more electronegative than sulfur creating a dipole bond. However, SO$_3$ is trigonal planar and the pulls cancel out.
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 9 - Molecular Geometry and Bonding Theories - Exercises - Page 391: 9.41c
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