Molar conductivities at infinite dilution (at 298 K) of NH₄CI, NaOH and NaCI are 129.8, 217.4 and 108.9 Ω⁻¹cm²mol⁻¹ respcetively. If the molar conductivity of a centimolar solution of NH₄OH is 9.33 Ω⁻¹cm²mol⁻¹, what is percentage dissociation of NH₄OH at this concentation ? Also calculte the dissociation constant for NH₄OH.