Solve this :

$$\begin{gathered} \mathrm{c}) \mathrm{A} \mathrm{compound} \mathrm{has} \mathrm{the} \mathrm{following} \mathrm{percentage} \mathrm{composition} : \\ \mathrm{Na}=18.60\%, \mathrm{S}=25.80\%, \mathrm{H}=4.03\%, \mathrm{O}=51.58\%. \\ \mathrm{The} \mathrm{molecular} \mathrm{weight} \mathrm{of} \mathrm{the} \mathrm{compound} \mathrm{is} 248. \mathrm{Calculate} \mathrm{the} \mathrm{molecular} \mathrm{formula} \mathrm{of} \mathrm{the} \mathrm{crystalline} \mathrm{salt}, \mathrm{assuming} \mathrm{all} \mathrm{hydrogen} \mathrm{to} \mathrm{be} \mathrm{present} \mathrm{as} \mathrm{water} \mathrm{of} \mathrm{crysallisatio} \\ [\mathrm{Na}=23, \mathrm{S}=32, \mathrm{O}=16, \mathrm{H}=1] \end{gathered}$$