The molar conductivity of 0.007 M acetic acid is 20 S cm² mol^-1. What is the dissociation constant of acetic acid? Choose the correct option.
$\left[\begin{array}{l}{\wedge }_{{\mathrm{H}}^{+}}^0=350 \mathrm{S} {\mathrm{cm}}^2 {\mathrm{mol}}^{-1}\\ {\wedge }_{{\mathrm{CH}}_3{\mathrm{COO}}^{-}}^0=50 \mathrm{S} {\mathrm{cm}}^2 {\mathrm{mol}}^{-1}\end{array}\right]$