Cân bằng các phương trình sau theo phương pháp electron
13, Fe + HNO3 rất loãng --> Fe(NO3)3 + NH4NO3 + H2O
14, Fe3O4 + HNO3 loãng nóng --> Fe(NO3)3 + NO2 + H2O
15, KMnO4 + HCl --> KCl + MnCl2 + Cl2 + H2O
16, Fe3O4 + HNO3 --> Fe(NO3)3 + NO + H2O
17, Cu + HNO3 --> Cu(NO3)2 + NO + H2O
18, FexOy + H2SO4 --> Fe2(SO4)3 + SO2 + H2O
19, K2Cr2O7 + HCl --> Cl2 + KCl + CrCl3 + H2O
20, A + HNO3 --> A(NO3)n + N2O + H2O
21, Fe + HNO3 --> Fe(NO3)3 + N2 + H2O
22, Cu + HNO3 --> Cu(NO3)2 + NO2 + H2O
23, Mg + HNO3 --> Mg(NO3)2 + NH4NO3 + H2O
24, Zn + HNO3 --> Zn(NO3)2 + NO + H2O
25, Al + H2SO4 --> Al2(SO4)3 + H2S + H2O
15, 2 KMnO4 + 16 HCl (đặc) --> 2 KCl + 2 MnCl2 + 5 Cl2 + 8 H2O
19, K2Cr2O7 + 14 HCl (đặc) --> 3 Cl2 + 2 KCl + 2 CrCl3 + 7 H2O
23, 4 Mg + 10 HNO3 (đặc,nóng) --> 4 Mg(NO3)2 + NH4NO3 + 3 H2O
<p class="span lang=" pt-br"="" 24,span="" ="" spanznspan="" ="" span+span="" spanhnosub3="" subspan="" span-->span="" ="" spanzn(nosub3="" sub)sub2span="" ="" span="" sub+span="" spannosubspan="" spanhsub2="" subo="" pp="" style="box-sizing: inherit; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-size: 1.1rem;">25, 8 Al + 15 H2SO4 (đặc,nóng) --> 4 Al2(SO4)3 + 3 H2S + 12 H2O
