II. cân bằng phương trình 18. Na + H2O --> NaOH + H2 19. K + H2O --> KOH + H2 20. Fe + HCl ---> FeCl2 + H2 21. Al + HCl ---> AlCl3 + H2 22. Zn + HCl ----> ZnCl2 + H2 23. Mg + HCl ----> MgCl2 + H2 24. Fe(OH)3 + HCl ----> FeCl3 + H2O 25. Fe(OH)2 + HCl ----> FeCl2 + H2O 26. Al(OH)3 + HCl ----> AlCl3 + H2O 27. Al + H2SO4 ---> Al2(SO4)3 + H2 28. Fe + H2SO4 ---> FeSO4 + H2 29. Zn + H2SO4 ---> ZnSO4 + H2 30. Fe(OH)3 + H2SO4 ---> Fe2(SO4)3 + H2O 31. Al(OH)3 + H2SO4 ---> Al2(SO4)3 + H2O 32. Al2(SO4)3 + KOH --> K2SO4 + Al(OH)3 33. Al2(SO4)3 + NaOH --> Na2SO4 + Al(OH)3 34. Al + Cl2 ---> AlCl3

2 câu trả lời

`18)2Na +2H_2O-> 2NaOH + H_2↑`

`19)2K+2H_2O->2KOH+H_2↑`

`20)Fe + 2HCl → FeCl_2 + H_2`

`21)Al + HCl -> AlCl_3 + H_2`

`22) 2HCl + Zn →ZnCl_2 + H_2`

`23)Zn + 2HCl → ZnCl_2 + H_2↑`

`24)Fe(OH)3 + 3HCl → FeCl_3+ 3H_2O`

`25)Fe(OH)_2 + 2HCl → FeCl_2 + 2H_2O`

`26)Al(OH)_3 + 3HCl → AlCl_3 + 3H_2O`

`27)2Al+ 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2`

`28)Fe + H_2SO_4 → FeSO_4 + H_2`

`29)Zn+H_2SO_4->ZnSO_4+H_2`

`30)2FeOH_3 + 3H_2SO_4 -> {Fe_2SO_4}_3 + 6H_2O`

`31)2Al(OH)_3 + 3H_2SO_4 → Al_2(SO_4)_3 + 6H_2O`

`32)6KOH + Al_2(SO_4)_3->3K_2SO_4 +2Al(OH)_3`

`33)6NaOH + Al_2(SO_4)_3 -> 2Al(OH)_3 + 3Na_2SO_4` 

`34)2Al + 3Cl_2  → 2AlCl_3` 

18. 2Na +2H2O --> 2NaOH + H2

19. 2K + 2H2O --> 2KOH + H2

20. Fe + 2HCl ---> FeCl2 + H2

21. 2Al + 6HCl ---> 2AlCl3 + 3H2

22. Zn + 2HCl ----> ZnCl2 + H2

23. Mg + 2HCl ----> MgCl2 + H2

24. 2Fe(OH)3 + 6HCl ----> 2FeCl3 + 6H2O

25. Fe(OH)2 + 2HCl ----> FeCl2 + 2H2O

26. 2Al(OH)3 + 6HCl ----> 2AlCl3 + 6H2O

27. 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2

28. Fe + H2SO4 ---> FeSO4 + H2 (đã cân bằng sẵn)

29. Zn + H2SO4 ---> ZnSO4 + H2 (đã cân bằng sẵn)

30. 2Fe(OH)3 + 3H2SO4 ---> Fe2(SO4)3 + 6H2O

31. 2Al(OH)3 + 3H2SO4 ---> Al2(SO4)3 + 6H2O

32. Al2(SO4)3 + 6KOH --> 3K2SO4 + 2Al(OH)3

33. Al2(SO4)3 + 6NaOH --> 3Na2SO4 + 2Al(OH)3

34. 2Al + 3Cl2 ---> 2AlCl3

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