Question

For the following reaction, Kc = 255 at 1000 K.

Answer 1

Answer: Equilibrium concentration of $CO=0.014M$  

Equilibrium concentration of $Cl_2=0.037M$  

Equilibrium concentration of $COCl_2=0.135M$  

Explanation:

Initial concentration of $CO=0.1490M$  

Initial concentration of $Cl_2=0.172M$  

The given balanced equilibrium reaction is,

                            $CO(g)+Cl_2(g)\rightleftharpoons COCl_2(g)$

Initial conc.         0.1490 M        0.172                 0

At eqm. conc.    (0.1490-x) M   (0.172-x) M   (x) M

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[COCl_2]}{[Cl_2]\times [CO]}$

$255=\frac{x}{(0.1490-x)\times (0.172-x)}$

$x=0.135$

Equilibrium concentration of $CO=(0.1490-x)M= (0.1490-0.135)=0.014M$  

Equilibrium concentration of $Cl_2=(0.172-x)M= (0.172-0.135)=0.037M$  

Equilibrium concentration of $COCl_2=0.135M$