The reaction you have provided can be analyzed as a decomposition reaction.
In this case, barium chlorate (Ba(ClO3)2) is decomposing into barium chloride (BaCl2) and oxygen gas (O2). Decomposition reactions involve a single compound breaking down into two or more simpler products.
The overall reaction can be summarized as follows:
\[ \text{Ba(ClO}_3\text{)}_2 \rightarrow \text{BaCl}_2 + 3 \text{O}_2 \]
Here, one formula unit of barium chlorate yields one formula unit of barium chloride and three molecules of oxygen gas.
Decomposition reactions are typically driven by the application of heat, and in this case, the heat would be necessary to break the bonds in barium chlorate to facilitate the release of oxygen gas.