The limiting molar conductivities of $\mathrm{NaI},{\mathrm{NaNO}}_3$ and ${\mathrm{AgNO}}_3$ $12.7,12.0$ and $13.3\mathrm{mS} {\mathrm{m}}^2{ \mathrm{mol}}^{-1}$, respectively  ). The molar conductivity of AgI at this temperature is _________ ${\mathrm{mSm}}^2{ \mathrm{mol}}^{-1}$