The values of equivalent conductivity at infinite dilutions for ${\mathrm{NH}}_4\mathrm{Cl}, \mathrm{NaOH} \mathrm{and} \mathrm{NaCl}$ are respectively 149.74, 248.1and $126.4 {\mathrm{ohm}}^{-1}{\mathrm{cm}}^{-2}{\mathrm{equi}}^{-1}.$The value of ${\mathrm{\lambda }}_{\mathrm{eq}}^{\infty } \mathrm{of} {\mathrm{NH}}_4\mathrm{OH}$ is