Chemistry => Chemical Nomenclature => Molecular formula
Explan
A hydrated compound is one that has water molecules in its structure. Depending on the water molecules that there are per mole of the dry compound, it will be the name it has.
The prefix Penta refers to the number 5. That is, for each mol of copper (II) sulfate, there will be 5 moles of water.
The ion sulfate has the following formula SO4^2-, copper (II) has a charge of 2+. So, copper (II) sulfate will be CuSO4.
Therefore the formula of copper (II) sulfate pentahydrate will be CuSO4.5H2O
Answer: C. CuSO4∙5H2O