trình bài ra hộ vs 1. FexOy + HNO3 Fe(NO3)3 + NO + H2O 2. Al + HNO3 Al(NO3)3 + NxOy + H2O 3. FexOy + CO FemOn + CO2 4. FexOy + HNO3 Fe(NO3)3 + NaOb + H2O 5. Fe3O4 + HNO3 Fe(NO3)3 + NxOy + H2O 6. FexOy + Al FemOn + Al2O3.

`1)`

`xFe^{2y//x} -> xFe^{+3} + (3x-2y)e | xx 3`

`N^{+5} + 3e -> N^{+2} | xx (3x-2y)`

`3Fe_xO_y + (12x-2y)HNO_3 -> 3xFe(NO_3)_3 + (3x-2y)NO + (6x-y)H_2O`

`2)`

`Al^0 -> Al^{+3} + 3e | xx (5x - 2y)`

`xN^{+5} + (5x-2y)e -> xN^{+2y//x} | xx 3`

`(5x-2y)Al + (18x-6y)HNO_3 -> (5x-2y)Al(NO_3)_3 + 3N_xO_y + (9x-3y)H_2O`

`3)`

`xmFe^{+2y//x} + (2my-2nx)e-> xmFe^{+2n//m} | xx 1`

`C^{+2} -> C^{+4} + 2e | xx (my - nx)`

$mFe_xO_y + (my-nx)CO \xrightarrow{t^o} xFe_mO_n + (my-nx)CO_2$

`4)`

`xFe^{+2y//x} -> xFe^{+3} + (3x-2y)e | xx (5a - 2b)`

`aN^{+5} + (5a - 2b)e -> aN^{+2b//a}`

`(5a-2b)Fe_xO_y + (18ax-2ay-6bx)HNO_3 -> (5ax-2bx)Fe(NO_3)_3 + (3x-2y)N_aO_b + (9ax-ay-3bx)H_2O`

`5)`

`3Fe^{+ 8//3} -> 3Fe^{+3} + 1e | xx (5x-2y)`

`xN^{+5} + (5x - 2y)e -> xN^{+2y//x} | xx 1`

`(5x-2y)Fe_3O_4 + (16x-6y)HNO_3 -> (15x-6y)Fe(NO_3)_3 + N_xO_y + (8x-3y)H_2O`

`6)`

`xmFe^{+2y//x} + (2my-2nx)e-> xmFe^{+2n//m} | xx 3`

`2Al^0 -> 2Al^{+3} + 6e | xx (my-nx)`

$3mFe_xO_y + (2my-2nx)Al \xrightarrow{t^o} 3xFe_mO_n + (my-nx)Al_2O_3$