$\mu _{BaC{l_2}}^\infty \, = \,\,\lambda _{B{a^{2 + }}}^\infty  + \,\,2\lambda _{C{l^ - }}^\infty \, = \,\,280.\,\,00$ ....... $(ii)$

$\mu _{N{H_4}Cl\,}^\infty  = \,\,\lambda _{NH_4^ + }^\infty \, + \,\,\lambda _{C{l^ - }}^\infty \,\, = \,\,129.80$ ....... $(iii)$

$\mu _{N{H_4}OH}^\infty  = \,\,\,\lambda _{NH_4^ + }^\infty  + \,\,\lambda _{O{H^ - }}^\infty  = \,\,\,?$

$Eq.\,\,(iii)\,\, + \,\frac{{Eq.(i)}}{2} - \frac{{Eq.(ii)}}{2}$

$\lambda _{NH_4^ + }^\infty  + \lambda _{O{H^ - }}^\infty  = \,\,\lambda _{N{H_4}OH}^\infty \, = \,\,\,\frac{{502.88}}{2}$

$\, = \,\,251.44\,\,oh{m^{ - 1}}\,c{m^2}mo{l^{ - 1}}$