The chemical reaction is:

CO $+$ Cl$2==>$ COCl$2.$ Suppose that you have measured the reaction products from and found out that they contained $3\mathrm{.}0$ kgs of chlorine; $10$ kgs of phosgene, and $7$ kgs of CO$.$ The kg mol of phosgene formed per kg mol of total reactants fed to the reactor.