# A certain compound is made up of one phosphorus (P) atom, three chlorine (Cl) atoms, and one oxygen (O) atom. What is the chemical formula of this compound?

Phosphoryl chloride, $O = P C {l}_{3}$, which in the lab you would call "POCKLE3"
The alternative representation is ""^(-)O-P^(+)Cl_3; you will see both representations in the texts.