The chemical formula of barium acetate is $Ba (CH_3COO) _2 $.

All things are formed by chemistry. To know the formula of barium acetate, it is necessary to clarify its structure and group. Barium, the element of metal, is active, and the valence state is often positive two. For acetate, $CH_3COO ^ - $, the valence state is negative one. Yin and yang are combined to form a substance. According to the principle of valence, positive and negative are offset, so barium and acetate are combined in one ratio to two to obtain the chemical formula of barium acetate $Ba (CH_3COO) _2 $. This formula also states the number and group of its atoms, which is the basis for chemical inquiry and the preparation of matter.