Question

Расставьте коэффициенты в окислительно-восстановительной реакции методом электронного баланса и написать вид 1) V2 O5 + Ca = V + Ca O2) Na N O3 = Na N O2 + O23) N H3 + O2 = N2 + H2 O4) Ca + H2 S O4 = Ca S O4 + H2 S + H2 O

Answer 1

1) V2 O5 + 5Ca = 2V + 5Ca O 2) 2Na N O3 = 2Na N O2 + O2 3) 4N H3 + 6O2 = N22 + 6H2 O 4) 2Ca + 2H2 S O4 =2 Ca S O4 + H2 S + H2 O

Answer 2

Balancing Redox Reactions Using the Electron Balance Method

Balancing redox reactions involves ensuring that the number of electrons lost in the oxidation half-reaction is equal to the number of electrons gained in the reduction half-reaction. Let's balance the given redox reactions using the electron balance method.

1) Balancing the reaction: V2O5 + Ca → V + CaO

The oxidation state of vanadium in V2O5 is +5, and in V it is +5. The oxidation state of calcium in Ca is 0, and in CaO it is +2.

The unbalanced half-reactions are: Oxidation: V2O5 → V Reduction: Ca → CaO

Balancing the oxidation half-reaction: V2O5 → 2V + 5O2

Balancing the reduction half-reaction: Ca + 1/2O2 → CaO

2) Balancing the reaction: NaNO3 → NaNO2 + O2

The oxidation state of nitrogen in NaNO3 is +5, and in NaNO2 it is +4. The oxidation state of sodium in NaNO3 is +1, and in NaNO2 it is +1. The oxidation state of oxygen in NaNO3 is -2, and in NaNO2 it is -2.

The unbalanced half-reactions are: Oxidation: NaNO3 → NaNO2 Reduction: NaNO3 → O2

Balancing the oxidation half-reaction: 2NaNO3 → 2NaNO2 + O2

3) Balancing the reaction: NH3 + O2 → N2 + H2O

The oxidation state of nitrogen in NH3 is -3, and in N2 it is 0. The oxidation state of hydrogen in NH3 is +1, and in H2O it is +1. The oxidation state of oxygen in O2 is 0, and in H2O it is -2.

The unbalanced half-reactions are: Oxidation: NH3 → N2 Reduction: O2 → H2O

Balancing the oxidation half-reaction: 4NH3 → N2 + 6H+ + 3e-

Balancing the reduction half-reaction: O2 + 4H+ + 4e- → 2H2O

4) Balancing the reaction: Ca + H2SO4 → CaSO4 + H2S + H2O

The oxidation state of calcium in Ca is 0, and in CaSO4 it is +2. The oxidation state of sulfur in H2SO4 is +6, and in H2S it is -2. The oxidation state of hydrogen in H2SO4 is +1, and in H2S it is +1. The oxidation state of oxygen in H2SO4 is -2, and in H2O it is -2.

The unbalanced half-reactions are: Oxidation: Ca → CaSO4 Reduction: H2SO4 → H2S + H2O

Balancing the oxidation half-reaction: Ca + H2SO4 → CaSO4 + SO2 + 2H+

Balancing the reduction half-reaction: 8H+ + 8e- + H2SO4 → H2S + 4H2O

These balanced redox reactions have been determined using the electron balance method.