Question

Predict the products of each of the following reactions and then balance the chemical equations.

(a) Fe is heated in an atmosphere of steam.
(b) NaOH is added to a solution of Fe(NO3)3.
(c) FeSO4 is added to an acidic solution of KMnO4.
(d) Fe is added to a dilute solution of H2SO4.
(e) A solution of Fe(NO3)2 and HNO3 is allowed to stand in air.
(f) FeCO3 is added to a solution of HClO4.
(g) Fe is heated in air.

Answer 1

Answer: The chemical equations are given below.

Step-by-step explanation:

• For a: Fe is heated in an atmosphere of steam.

The chemical equation follows:

`3Fe(s)+4H_2O(g)\rightarrow Fe_3O_4(s)+4H_2(g)`

By Stoichiometry of the reaction:

3 moles of iron reacts with 4 moles of steam to produce 1 mole of iron (II,III) oxide and 4 moles of hydrogen.

• For b: NaOH is added to a solution of
  `Fe(NO_3)_3`

The chemical equation follows:

`Fe(NO_3)_3+3NaOH\rightarrow Fe(OH)_2+3NaNO_3`

By Stoichiometry of the reaction:

1 mole of iron nitrate reacts with 3 moles of sodium hydroxide to produce 1 mole of iron hydroxide and 3 moles of sodium nitrate.

• For c:
  `FeSO_4` is added to an acidic solution of
  `KMnO_4`

The chemical equation follows:

`10FeSO_4+2KMnO_4+8H_2SO_4\rightarrow 5Fe_2(SO_4)_3+K_2SO_4+2MnO_4+8H_2O`

By Stoichiometry of the reaction:

10 moles of iron(II) sulfate reacts with 2 moles of potassium permangante and 8 moles of sulfuric acid to produce 5 moles of iron(III) sulfate, 1 mole of potassium sulfate, 2 moles of manganese oxide and 8 moles of water.

• For d: Fe is added to a dilute solution of
  `H_2SO_4`

The chemical equation follows:

`Fe+H_2SO_4\rightarrow FeSO_4+H_2`

By Stoichiometry of the reaction:

1 mole of iron reacts with 1 mole of sulfuric acid to produce 1 mole of iron sulfate and 1 mole of hydrogen gas.

• For e: A solution of
  `Fe(NO_3)_2` and
  `HNO_3` is allowed to stand in air.

The chemical equation follows:

`3Fe(NO_3)_2+4HNO_3\rightarrow 3Fe(NO_3)_3+NO+H_2O`

By Stoichiometry of the reaction:

3 moles of iron(II) nitrate reacts with 4 moles of nitric acid to produce 3 moles of iron(III) nitrate, 1 mole of nitric oxide and 1 mole of water.

• For f:
  `FeCO_3` is added to a solution of
  `HClO_4`

The chemical equation follows:

`FeCO_3+2HClO_4\rightarrow Fe(ClO_4)_2+CO_2+H_2O`

By Stoichiometry of the reaction:

1 mole of iron(II) carbonate reacts with 2 moles of perchloric acid to produce 1 moles of iron(II) perchlorate, 1 mole of carbon dioxide and 1 mole of water.

• For g: Fe is heated in air

The chemical equation follows:

`2Fe+O_2\rightarrow 2FeO`

By Stoichiometry of the reaction:

2 moles of iron reacts with 1 mole of oxygen gas to produce 2 moles of iron(II) oxide.

Hence, the chemical equations are given above.