The conductance of a 0.0015 M aqueous solution of a weak monobasic acid was determined by using a conductivity cell consisting of platinized Pt electrodes. The distance between the electrodes is 120 cm with an area of cross section of $1 \mathrm{~cm}^2$. The conductance of this solution was found to be $5 \times 10^{-7} \mathrm{~S}$. The pH of the solution is 4 . The value of limiting molar conductivity ( $\Lambda_{\mathrm{m}}^0$ ) of this weak monobasic acid is aqueous solution is $\mathrm{Z} \times 10^2 \mathrm{~S} \mathrm{~cm}^{-1}$. The value of Z is