At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is $9.54{\mathrm{ohm}}^{-1}{\mathrm{cm}}^2{\mathrm{mol}}^{-1}$ and at infinite dilution its molar conductance is $238{\mathrm{ohm}}^{-1}{\mathrm{cm}}^2{\mathrm{mol}}^{-1}$  The degree of ionisation of ammonium hydroxide at the same concentration and temperature is