Here's how to balance the equation for the reaction of Iron(II) sulfate and ammonium sulfide:

1. Write the Unbalanced Equation:

FeSO₄(aq) + (NH₄)₂S(aq) → FeS(s) + (NH₄)₂SO₄(aq)

2. Identify the Ions:

* Reactants:

* Fe²⁺ (iron(II) ion)

* SO₄²⁻ (sulfate ion)

* NH₄⁺ (ammonium ion)

* S²⁻ (sulfide ion)

* Products:

* FeS (iron(II) sulfide)

* NH₄⁺ (ammonium ion)

* SO₄²⁻ (sulfate ion)

3. Balance the Equation:

* Iron (Fe): The equation has one iron atom on each side, so it's already balanced.

* Sulfur (S): The equation has one sulfur atom on each side, so it's already balanced.

* Ammonium (NH₄): The equation has two ammonium ions on each side, so it's already balanced.

The Balanced Equation:

FeSO₄(aq) + (NH₄)₂S(aq) → FeS(s) + (NH₄)₂SO₄(aq)