Question

Расставить коэффициенты методом электронного баланса:FeS2 + HNO3 = Fe(NO3)3 + H2SO4 + NO + H2O

Answer 1

FeS2 + HNO3 = Fe(NO3)3 + H2SO4 + NO + H2O
Fe(+2) - 1 e =  Fe(+3) |  окисление
N(+5) + 3e = N(+2)     | 5 восстановление
S(-2) -14e = S(+6)      | окисление 
Fe и S восстановителb, N - окислитель
FeS2 + 8 HNO3 = Fe(NO3)3 + 2 H2SO4 + 5 NO + 2 H2O

Answer 2

Fe⁺²S₂⁻¹ + 8H⁺N⁺⁵O₃⁻² = Fe⁺³(N⁺⁵O₃⁻²)₃ + 2H₂⁺¹S⁺⁶O₄⁻²+5N⁺²O⁻²+2H₂⁺¹O⁻²
Fe⁺²-1e+Fe⁺³         1 вос-ль, ок-ние
2S⁻¹ -14e=  2S⁺⁶    1 в-ль, окние
N⁺⁵ + 3e=N⁺²         5 ок-ль, вос-ние

Answer 3

Balancing the Chemical Equation Using the Electron Balance Method

To balance the chemical equation FeS2 + HNO3 = Fe(NO3)3 + H2SO4 + NO + H2O using the electron balance method, we need to ensure that the number of electrons lost in the oxidation half-reaction is equal to the number of electrons gained in the reduction half-reaction.

Step 1: Identify the Half-Reactions

The given chemical equation can be split into two half-reactions: the oxidation half-reaction and the reduction half-reaction.

The oxidation half-reaction is: FeS2 → Fe(NO3)3 The reduction half-reaction is: HNO3 → H2SO4 + NO + H2O

Step 2: Balance the Atoms

# Oxidation Half-Reaction:

The atoms are already balanced in the oxidation half-reaction.

# Reduction Half-Reaction:

The reduction half-reaction is unbalanced. We need to balance the atoms in the reduction half-reaction.

Step 3: Balance the Charges

# Oxidation Half-Reaction:

The charges are already balanced in the oxidation half-reaction.

# Reduction Half-Reaction:

The reduction half-reaction is unbalanced in terms of charges. We need to balance the charges by adding electrons.

Step 4: Balance the Electrons

To balance the reduction half-reaction, we need to add electrons to one side of the equation to ensure that the charges are balanced.

The balanced reduction half-reaction is: 8H+ + 5HNO3 + 3e- → 5NO + 4H2O

Step 5: Combine the Half-Reactions

Now that both half-reactions are balanced, we can combine them to obtain the balanced overall chemical equation.

The balanced overall chemical equation is: FeS2 + 5HNO3 + 3H2O → Fe(NO3)3 + 3H2SO4 + 5NO

This is the balanced chemical equation using the electron balance method.