77. Solving a chemistry problem

9. In benzene, picric acid exists in the form of single C6H2(NO2)3OH molecules and does not dissociate into ions. Equilibrium concentrations of C in the aqueous and benzene layers (mol/l):
Water layer (C*103) 2.08 3.27 7.01 10.1
Benzene layer (С*103) 0.932 2.25 10.1 19.9

Calculate K using the equation K=[C1 (l-α)] /n√С2, where α is the degree of dissociation in phase I; n is the number of molecules in the associated complex in phase 2.