Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 113: 3.15b


$2KClO_3(s)\rightarrow 2KCl(s)+3O_2(g)$

Work Step by Step

$KClO_3(s)\rightarrow KCl(s)+O_2(g)$ $K$ and $Cl$ are balanced, but the left side has an odd number of $O$ atoms which only appear in pairs on the right side. Add a coefficient of 2 to $KClO_3$ to create an even number of $O$ atoms on the left side. This requires you to also add a coefficient of 2 to $KCl$ to keep $K$ and $Cl$ in balance. $2KClO_3(s)\rightarrow 2KCl(s)+O_2(g)$ The left side now has 6 $O$ atoms, so add a coefficient of 3 to $O_2$. $2KClO_3(s)\rightarrow 2KCl(s)+3O_2(g)$
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