Problem: Write the formula for copper(II) sulfate pentahydrate.a. Cu2SO3•H5b. (CuSO4)5c. CuS•5H2Od. Cu2S•H2Oe. CuSO4•5H2O

We’re being asked to give the chemical formula of copper(II) sulfate pentahydrate.

The rules for naming polyatomic ionic compounds are as follows:

1. The metal keeps its name and is named and written first.

– For transition metals, we use Roman numerals to denote its charge.

2. Name the polyatomic ion as you would normally.

3. Hydrates → H₂O, the prefix will determine the coefficient. Separated by a dot form the main molecule.