The limiting molar conductivities of $\mathrm{Nal}^{\circ} \mathrm{NaNO}_3$ and $\mathrm{AgNO}_3$ are $12.7,12.0$ and $13.3 \mathrm{mS} \mathrm{m}^2 \mathrm{~mol}^{-1}$, respectively (all at $25^{\circ} \mathrm{C}$ ). The limiting molar conductivity of Agl at this temperature is $\_\_\_\_$ $\mathrm{mS} \mathrm{m} \mathrm{mol}^{-1}$