For the reaction 2nobr (g) ↔ 2no (g) + br2 (g), when the concentrations are [nobr] = 0.10 m, [no] = 0.010 m, and [br2] = 0.0050 m, what is the equilibrium constant of this reaction? a. 5.0 × 10–5 m b. 0.000005 m c. 5.0 × 105 m d. 5.0 m e. none of the above

 B. 0.000005

Explanation:

Equilibrium constant is the ratio of the concentration of products to the concentration of reactants each term raised to its stochiometric coefficients.

The given balanced equilibrium reaction is,

At eqm. conc.            0.10 M      0.010 M      0.0050 M

The expression for equilibrium constant for this reaction will be,

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

Thus the value of the equilibrium constant is 0.000005 M .