Answer : The value of equilibrium constant is, 0.166
Solution : Given,
Concentration of A = 9.60 M
Concentration of B = 10.0 M
Concentration of C = 4.00 M
Concentration of D = 4.00 M
The equilibrium reaction will be,

The expression for equilibrium constant is,
![K_c=([C][D])/([A][B])](https://img.qammunity.org/2017/formulas/chemistry/high-school/t4o5pjw6y20z6a89dbp6g939txm5s9ws32.png)
Now put all the given values in this expression, we get the values of equilibrium constant.

Therefore, the value of equilibrium constant is, 0.166