142. Solving a chemistry problem

9.14. Calculate the electrophoretic mobility of corundum particles in water, if it is known that the speed of electroosmosis through the corundum diaphragm in the same solution is 2 · 10–9 m3 / s,
the electrical conductivity of the solution is Xv = 1.2 * 10–2 Ohm – 1 * m – 1;
surface conductivity of the diaphragm Xs = 2 * 10–2 Ohm – 1 * m – 1; current intensity during electroosmosis I = 4.5 * 10–2 A; e is 81; n = 1 * 10–3 Pa * s.