The equation is Fe + 4HgO -> 2Fe2O3 + 4Hg.

1. Detailed information about the equation Fe + 4HgO -> 2Fe₂O₃ + 4Hg

The above chemical equation represents the chemical reaction process between iron (Fe) and mercury(II) oxide (HgO) to produce iron(III) oxide (Fe₂O₃) and mercury (Hg).

According to the equation, each iron (Fe) molecule will react with four molecules of mercury(II) oxide (HgO) to produce two molecules of iron(III) oxide (Fe₂O₃) and four molecules of mercury (Hg).

2. Reaction conditions

The specific conditions for the reaction may depend on various factors, including temperature, pressure, and the reaction environment. However, specific information about the conditions of this reaction is not specified in the chemical equation.

3. Reaction process

The reaction process occurs when solid iron reacts with solid mercury(II) oxide to produce iron(III) oxide and mercury, both in solid state.

4. Phenomena occurrence

When the reaction occurs, a noticeable phenomenon is the color change due to the formation of iron(III) oxide, a reddish-brown solid.