The equilibrium constant (Kc) for this equilibrium mixture for the reaction
2 BrCl3 ⇔ Br2 + 3 Cl2 is 11.94
calculation
Kc=( concentration of the product raised to their coefficients/ concentration of the reactant raised to their coefficient)
Kc={( Br2) Cl2)^2} /(BrCl3)^2
find the concentration of the reactant and products
=moles/volume in liters
BrCl3 = 1.0 /6.0 = 0.167M
Br= 2.0 /6.0 =0.333 M
Cl2=6.0/6.0 =1.00 M
Kc is therefore = {(0.333) (1.00)^3 / (0.167)^2} = 11.94