You need to provide more information to determine the ratio of moles of CuSO₄ to water. The ratio depends on the specific hydrate of copper sulfate you are referring to.

Here's why:

* Copper sulfate can form different hydrates: The most common is copper sulfate pentahydrate (CuSO₄·5H₂O). This means each formula unit of CuSO₄ is associated with 5 water molecules.

* Other hydrates exist: Copper sulfate can also form other hydrates like CuSO₄·H₂O (monohydrate), CuSO₄·3H₂O (trihydrate), etc.

To determine the ratio, you need to know the specific hydrate.

Example:

For copper sulfate pentahydrate (CuSO₄·5H₂O):

* Moles of CuSO₄: 1 mole

* Moles of water: 5 moles

* Ratio: 1:5

Let me know the specific hydrate you're interested in, and I can calculate the ratio for you.