Question is incomplete.
The correct question should be
Many chemical compounds have both common and systematic names. common names are historical and tend not to identify the elements that make up the compound. however, the systematic name allows for correct identification of the cations and anions that together make up the ionic compound.
A ) What is the chemical forula for potassium permanganate?
B) What is the chemical formula of Copper (II) sulfate ?
C) Sodium carbonate is used in the manufacture of paper. What is the chemical formula for this compound?
Answer: -
A) KMnO₄
B) CuSO₄
C) Na₂CO₃