Question

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Chọn hệ số để cân bằng phản ứng sau:

1/ Al +O² ---> Al² O³

2/ K + O²---> K²O

3/ Al(OH)³ t° ---> Al² O³ + H²O

4/ Al²O³ + HCl ---> AlCl³+ H²O

5/ Al + HCl ---> AlCl³ + H²↑

6/ FeO + HCl ---> FeCl² + H²O

7/ Fe²O³ + H²SO⁴ ---> Fe²(SO⁴)³ + H²O

8/ NaOH + H²SO⁴ ----> Na²SO⁴ + H²O

9/ Ca(OH)² + FeCl³ ---> CaCl² + Fe(OH)³↓

10/ BaCl² + H²SO⁴ ---> BaSO⁴ ↓ + HCl

Answer 1

1/ 4Al+3O2->2Al2O3

2/ 4K+O2->2K2O

3/ 2Al(OH)3-->Al2O3+3H2O

4/ Al2O3+6HCl->2AlCl3+3H2O

5/ 2Al+6HCl->2AlCl3+3H2

6/ FeO+2HCl->FeCl2+H2O

7/ Fe2O3+3H2SO4->Fe2(SO4)3+3H2O

8/ 2NaOH+H2SO4->Na2SO+2H2O

9/ 3Ca(OH)2+2FeCl3->3CaCl2+2Fe(OH)3

10/ BaCl2+H2SO4->BaSO4+2HCl

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