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^° C is ____ mm Hg.…

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