Phosgene $($carbonyl chloride$),$ COCl$2$

$,$ is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures:

CO$($g$)+$Cl$2($g$)$COCl$2($g$)$

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at $472$C

$.$ At equilibrium, the concentrations were measured and the following results obtained: