The molar conductivity of 0.007 M acetic acid is 20 S cm^2 mol^-1. What is the dissociation constant of acetic acid? Choose the correct option.…

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