How do you balance #KClO_3(s) -> KCl(s) + O_2(g)#?
Using oxidation states.
We have to realize that this is a redox reaction.
Chlorine is being reduced while oxygen is being oxidized.
Chlorine oxidation state is
Oxygen oxidation state is
Write Half Reactions.
Balance electrons in accordance to conservation of charges.
Thus interpreting this means that there is
Thus simplify the equation by a factor of 2,