80 mole percent of \(MgCl _2\) is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of …

80 mole percent of \(MgCl _2\) is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of \(MgCl _2\) at \(38^{\circ} C\) is________ \(mm Hg\). (Nearest Integer)

Given : Vapour pressure of water at \(38^{\circ} C\) is \(50 ~mmHg\)

[JEE Main 2023, 12 Apr (Shift 1)]