3. 4Na+O2->2Na2O
Si+O2->SiO2
2C6H6+15O2->12CO2+6H2O
4. 2KClO3->2KCl+3O2
2Ba+O2->2BaO
4Cr+3O2->2Cr2O3
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3. 4Na+O2->2Na2O
Si+O2->SiO2
2C6H6+15O2->12CO2+6H2O
4. 2KClO3->2KCl+3O2
2Ba+O2->2BaO
4Cr+3O2->2Cr2O3