Decrease of volume by half in equilibrium - with specific numbers- how to solve?
I solved the quadratic equation by Wolfram Alpha



The solution indicates that $\ce{[Cl2]}=\pu{1.26926M}&lt;\pu{2M}$,but$[\ce{CO}]=\pu{1.26926M}&lt;\pu{2M}$, if we have
1 mol of $\ce{CO}$, 2 Mols of $\ce{Cl2}$,and 9.765 Mols of $\ce{COCl2}$
contained in 1 L.