Carbon monoxide CO as has carbon and oxygen atoms in the ratio 1:1 so it is already as simple as it can be, and the empirical formula is a CO, the same as the molecular formula.
BraAttach each section of exposed copper to the appropriate terminal screw: green wire to the green grounding screw, white (neutral) to the silver screw, and black (“hot”) to the brass screw. Wrap the wire clockwise around the terminal and tighten each screw securely.