`a) 8Al + 3Fe_(3)O_(4) -> 4Al_(2)O_(3) + 9Fe`

`b) Fe_(2)O_(3) + 3CO -> 2Fe + 3CO_(2)`

`c) Fe_(3)O_(4) + 4CO -> 3Fe + 4CO_(2)`

`d) Fe_(3)O_(4) + 8HCl -> FeCl_(2) + 2FeCl_(3) + 4H_(2)O`

`e) 4Fe(OH)_(2) + O_(2) + 2H_(2)O -> 4Fe(OH)_(3)`

`f) 4Fe(OH)_(2) + O_(2) -> 2Fe_(2)O_(3) + 4H_(2)O`

`g) 2C_(2)H_(6)O + 7O_(2) -> 4CO_(2) + 6H_(2)O`

`h) C_(4)H_(8)O_(2) +5O_(2) -> 4CO_(2) + 4H_(2)O`

`i) 4C_(3)H_(9)N + 21O_(2) -> 12CO_(2) + 2N_(2) + 18H_(2)O`
`k) 4C_(2)H_(5)O_(2)N + 9O_(2) -> 8CO_(2) + 2N_(2) + 10H_(2)O`

`l) Na_(2)CO_(3) + CaCl_(2) -> CaCO_(3) + 2NaCl`

`m) 3Ba(OH)_(2) + 2H_(3)PO_(4) -> Ba_(3)(PO_(4))_(2) + 6H_(2)O`

`n) Na_(2)SO_(4) + Ba(NO_(3))_(2) -> BaSO_(4) + 2NaNO_(3)`

`o) (NH_(4))_(2)SO_(4) + Ba(OH)_(2) -> BaSO_(4) + 2NH_(3) + H_(2)O`
`p) MnO_(2) + 4HCl -> MnCl_(2) + Cl_(2) + 2H_(2)O`