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

When she introduced $0\mathrm{.}128$ moles of CO$($g$)$ and $0\mathrm{.}165$ moles of Cl$2($g$)$ into a $1\mathrm{.}00$ Liter container, she found the equilibrium concentration of Cl$2($g$)$ to be $6\mathrm{.}69$E$-2$ M$.$

Calculate the equilibrium constant, Kc$,$ she obtained for this reaction.

Kc $=$