12. Solving a chemistry problem

191. The resistance of an aqueous solution of ammonium hydroxide with a concentration of 0.0312 mol / l in a conductometric cell with a constant of 40 m-1 at 25ºС is 1965 ohms. What are the degree and dissociation constant of ammonium hydroxide at this temperature? The limiting equivalent electrical conductivities of NH4 and OH- ions at this temperature are respectively 0.00735 Ohm-1mol-1m2 and 0.01992 Ohm-1mol1 m2.