The molar conductivity of NaCl varies with the concentration as shown in the following table and all values follows the equation  ${\lambda }_m^C={\lambda }_m^{\infty }-b\sqrt{C}$ Where  ${\lambda }_m^C$=molar conductivity at given concentration   ${\lambda }_m^{\infty }$=Molar conductivity at infinite dilution  C=Molar concentration

Molar Concentration of NaCl	Molar conductivity $\left[{\lambda }_m^c\right]$ $oh{m}^{-1}c{m}^{2}mol{e}^{-1}$
$4\times {10}^{-4}$	107
$9\times {10}^{-4}$	97
$16\times {10}^{-4}$	87

When a certain conductivity cell was filled with  $25\times {10}^{-4}MNaCl$ solution. The resistance of the cell was found to be 1000 ohm.