On the number of carbon atoms in ammonium acetate
If you want to know the number of carbon atoms in ammonium acetate, you must first know the chemical formula of ammonium acetate. For ammonium acetate, the chemical formula is $CH_ {3} COONH_ {4} $.

Looking at its chemical formula, in a "$CH_ {3} COO $" group, the "$CH_ {3} $" part has one carbon atom, and the "$COO $" part also has one carbon atom, so an acetate "$CH_ {3} COO ^ - $" contains two carbon atoms. Ammonium "$NH_ {4} ^ + $" has no carbon atoms.

In summary, the number of carbon atoms in a molecule of ammonium acetate is two.