Answer:
2 phosgene molecules
Step-by-step explanation:
Element: Atoms in reaction
C: 2
O: 2
Cl: 4
(Would be C: 1, O: 1, Cl:4, but there are two molecules of carbon monoxide and chlorine)
Since phosgene is
, it needs 1 carbon, 1 oxygen, and 2 chlorine atoms. Since there are 2 carbon, 2 oxygen, and 4 chlorine,
The reaction will produce 2 phosgene molecules