If 0.40 moles of pcl5 is heated in a 10.0 l container, equilibrium is established in which 0.25 moles of cl2 are present. the reaction is: pcl5(g)\longleftrightarrow ⟺ pcl3(g) + cl2(g) what is the value of the equilibrium constant?

0.0036

Explanation:

Initial moles of   = 2 mole

Moles of   at equilibrium= 0.25 mole

Volume of container = 10 L

Initial concentration of

equilibrium concentration of

The given balanced equilibrium reaction is,

Initial conc.         0.2 M              0         0 

At eqm. conc.    (0.2-x) M       xM       xM

The expression for equilibrium constant for this reaction will be,

We are given : x = 0.025 M

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

Thus the value of the equilibrium constant is 0.0036.

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