Phosgene (COCl₂) is a toxic substance that forms readily from carbon monoxide and chlorine at elevated temperatures:CO(g) + Cl₂(g) ⇄ COCl₂(g)If 0.350 mol of each reactant is placed in a 0.500-L flask at 600 K, what are the concentrations of all three substances at equilibrium (Kc = 4.95 at this temperature)?

Chemical equilibrium refers to the situation in a chemical process where both the reactants and products are present in concentrations that have no further tendency to vary over time, preventing any discernible change in the system's characteristics.

Moles of [tex]CO[/tex] and [tex]Cl_{2}[/tex] = 0.430 mole

Volume of solution = 0.500 L

Initial concentration of [tex]CO[/tex] and [tex]Cl_{2}[/tex] = 0.860

The given balanced equilibrium reaction is,

CO(g) + Cl₂(g) ⇄ COCl₂(g)

Initial conc. 0.860M 0.860M 0

At eqm. conc. (0.860-x) M (0.860-x) M (x) M

The expression for equilibrium constant for this reaction will be,

Now put all the given values in this expression, we get :

By solving the term 'x', we get :

x = 0.532 M

Thus, the concentrations of at equilibrium are :

Concentration of [tex]CO[/tex]= (0.860-x) M =(0.860-0.532) M = 0.328 M

Concentration of[tex]Cl_{2}[/tex] = (0.860-x) M = (0.860-0.532) M = 0.328 M

Concentration of [tex]COCl_{2}[/tex]= x M = 0.532 M

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