Question

Điền vào dấu ? rồi cân bằng PTHH:

? + H2SO4 -> Al2(SO4)3 + H2

CH4 + ? -> CO2 + H2O

? + ? -> Fe3O4

Fe + ? -> FeCl3

? + ? ->FeS

? + Fe(SO4)3 -> Fe(OH)3 + BaSO4

Answer 1

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂

CH₄ + 2O₂ -> CO₂ + 2H₂O

3Fe + 2O₂ -> Fe₃O₄

2Fe + 3Cl₂ -> 2FeCl₃

Fe + S -> FeS

3Ba(OH)₂ + Fe₂(SO₄)₃ -> 2Fe(OH)₃ + 3BaSO₄

Answer 2

1. 2Al + 3H₂SO₄ ===> Al₂(SO₄)₃ + 3H₂\(\uparrow\)

2. CH₄ + 2O₂ =(nhiệt)=> CO₂ + 2H₂O

3. 3Fe + 2O₂ =(nhiệt)=> Fe₃O₄

4. 2Fe + 3Cl₂ =(nhiệt)=> 2FeCl₃

5. Fe + S =(nhiệt)=> FeS

6. 3Ba(OH)₂ + Fe₂(SO₄)₃ ===> 2Fe(OH)₃\(\downarrow\) + 3BaSO₄\(\downarrow\)

Answer 3

Al₂+ 3H₂SO_{4 ->} Al₂(SO₄)₃ + 3H₂

CH₄+ 2O₂ -> CO₂+ 2H₂O

Fe3 +2O2-> Fe3O4

Fe+S->FeS