Answer: The chemical formula of ammonium sulfate is

Step-by-step explanation:
Ammonium sulfate is a salt which is formed by the combination of two polyatomic ions which are ammonium and sulfate ions.
The chemical formula for ammonium ion is
and the chemical formula for sulfate ions is

By criss-cross method, the oxidation states of the ions becomes the subscripts of the other ions.
Hence, the chemical formula of ammonium sulfate is
