Answer
$NO_2$
Work Step by Step
The diagram shows there are two times as many O as N in the product of the decomposition so the original formula must have been $NO_2$.
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 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 112: 3.3a
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