Final answer:
The formula for lithium acetate dihydrate is LiC2H3O2 · 2H2O, incorporating two water molecules per unit of lithium acetate.
Step-by-step explanation:
The formula for the hydrate lithium acetate dihydrate is written by stating the chemical formula for anhydrous lithium acetate followed by a vertically centered dot and the number of water molecules present in the hydrate. Lithium acetate by itself is LiC2H3O2 and since it is a dihydrate, it has two molecules of water associated with each formula unit. Thus, the formula for lithium acetate dihydrate is LiC2H3O2 · 2H2O.