giúp em với ạ em đang cần gấp Cân bằng các ptrinh sau: Mg+HNO3-> Mg(NO3)2+NH4NO3+N2+H2O (tỉ lệ mol NH4NO3:N2 = 2:1) Al+HNO3-> Al(NO3)2+N2O+N2 +NO2+H2O (tỉ lệ mol N2O:N2 :NO2=3:2:1)

$ 13\mathop{Mg}\limits^{0}+32H\mathop{N}\limits^{+5}O_3 \to 13\mathop{Mg}\limits^{+2}(NO_3)_2+2\mathop{N}\limits^{-3}H_4NO_3+\mathop{N_2}\limits^{0}+12H_2O$

`xx13|` $\mathop{Mg}\limits^{0}\to \mathop{Mg}\limits^{+2}+2e$

`xx1|` $4\mathop{N}\limits^{+5}+ 26e\to 2\mathop{N}\limits^{-3}+\mathop{N_2}\limits^{0}$

`-------------------`

$ 15\mathop{Al}\limits^{0}+56H\mathop{N}\limits^{+5}O_3 \to 15\mathop{Al}\limits^{+3}(NO_3)_3+3\mathop{N_2}\limits^{+1}O+2\mathop{N_2}\limits^{0}+\mathop{N}\limits^{+4}O_2+28H_2O$

`xx15|` $\mathop{Al}\limits^{0}\to \mathop{Al}\limits^{+3}+3e$

`xx1|`$11\mathop{N}\limits^{+5}+45e\to 3\mathop{N_2}\limits^{+1}+2\mathop{N_2}\limits^{0}+\mathop{N}\limits^{+4}$