80 mole percent of MgCl2 is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of $\mathrm{MgCl}_2$ at $38^{\circ} \mathrm{C}$ is $\quad \mathrm{mm} \mathrm{Hg}$. (Nearest integer) Given: Vapour pressure of water at 38°C is 50 mmHg
