\(4Na+O_2\underrightarrow{^{to}}2Na_2O\)
\(4P+5O_2\underrightarrow{^{to}}2P_2O_5\)
\(S+O_2\underrightarrow{^{to}}SO_2\)
\(2KClO_3\underrightarrow{^{to}}2KCl+3O_2\)
\(2H_2O\underrightarrow{^{to}}2H_2+O_2\)
1.4Na+O2-to---->2Na2O
2.4P+5O2---to-->P2O5
3.S+O2---to--->SO2
4.2KClO3-to----->3O2+2KCL
5.2H2O----->2H2+O2