To find the dissociation constant of acetic acid, we will use the relationship between molar conductivity,$\\$degree of dissociation, and the dissociation constant.$\\$Given:$\\ \Lambda_m = 20 \, \mathrm{S \, cm^2 \, mol^{-1}} \\ c = 0.007 \, \mathrm{M} \\ \Lambda_{{H}^+}^0 = 350 \, \mathrm{S \, cm^2 \, mol^{-1}} \\ \Lambda_{{CH}_3{COO}^-}^0 = 50 \, \mathrm{S \, cm^2 \, mol^{-1}} \\$