Interpretation:
The chemical formula for the polyatomic APA ion is to be written.
Concept introduction:
In the molecular formula, the element symbols and the number of the subscript tells the type and the number of each atom in a molecule.
There are so many methods to represent a molecule. In the ball-and-stick method, the atoms of each element are depicted by a ball and the bond is depicted by a stick. In the structural formula method, the atoms of each element are depicted by letter symbols and bond is used to show relative position.

Answer to Problem 145A
The chemical formula for the polyatomic APA ion is
Explanation of Solution
Ions are atoms or groups of atoms with an overall charge. The charge can be positive or negative. The structural formula for the APA ion is given in the figure shown below.
In the given structural formula, there are eight carbon atoms, five hydrogen atoms, one nitrogen atom, four oxygen atoms, and two negative charges. Therefore, the chemical formula for the polyatomic APA ion is
The chemical formula for the polyatomic APA ion is
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