What is the formula for iron(II) acetate again?

Iron(II) acetate is formed when iron is coordinated with acetate ions. The "(II)" in the nomenclature indicates that iron has a +2 oxidation state in this compound. Acetate is derived from acetic acid and has the formula C2H3O2^-.

To determine the formula for iron(II) acetate, one must consider that each acetate ion has a single negative charge. Therefore, to balance the +2 charge from iron, two acetate ions are needed. This gives the formula Fe(C2H3O2)2, indicating one iron ion paired with two acetate ions.

The structure reflects that iron is in the +2 oxidation state and there are two acetate units tethered to it, confirming that option A correctly represents the composition of iron(II) acetate.

Other options do not correctly represent the compound. For example, they may have the wrong number of acetate ions or use improper formulas for the acetate ion itself, which is crucial for achieving the correct compound formation.