Question

An aqueous solution is prepared by dissolving $0.1 \,mol$ of an ionic salt in $1.8\, kg$ of water at $35^{\circ} C$. The salt remains $90 \%$ dissociated in the solution. The vapour pressure of the solution is $59.724\, mm$ of Hg Vapor pressure of water at $35^{\circ} C$ is $60.000\, mm$ of Hg. The number of ions present per formula unit of the ionic salt is_____

Answer 1

The number of ions present per formula unit of the ionic salt is 5.