The chemical formula Fe2(SO3)3 indicates nothing above. Chemical formulas are used in chemistry to refer to compounds and elements. There are various different types of compounds, having different types of bonding among them such as covalent bonding and ionic bonding.
Chemical formulas are used in chemical reactions so as to study the effect that occurs when compounds react with each other. The formation of new chemical formulas are based on rules of reaction engineering. Chemical formulas are used in all domains of sciences, and majorly in chemistry and its subdomains including organic chemistry, inorganic chemistry, biochemistry, chemical and particle chemistry.