Answer
$2Sr(s)+O_2(g)\rightarrow2SrO(s)$
Work Step by Step
Molecular oxygen exists as $O_2(g)$. To balance the equation both atoms of oxygen must be used, so 2 molecules of $SrO(s)$ must be created, requiring an input of 2 $Sr(s)$ atoms..
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 7 - Periodic Properties of the Elements - Additional Exercises - Page 295: 7.90a
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