The molar conductivity of 0.007 M acetic acid is 20 S $\text{cm}^2$ $\text{mol}^{-1}$. What is the dissociation constant of acetic acid? Choose the correct option $\lambda_{oH} = 350 \, \text{S cm}^2 \, \text{mol}^{-1} \\ \lambda_o = 50 \, \text{S cm}^2 \, \text{mol}^{-1}$