Question

how many moles of oxygen are in one mole of CuSO4

Answer 1

So, if you look at the molecular formula. One mole of CuSO4 contains one moles of copper, one mole of sulfur, and four moles of oxygen.

This can also be as a molecule. One molecule of CuSO4 has one atom of copper, one atom of sulfur, and 4 atoms of oxygen. :)