${\mathrm{\Delta T}}_{\mathrm{b}}={\mathrm{K}}_{\mathrm{b}}\times \mathrm{m}$

$\mathrm{m}=\frac{\mathrm{\Delta }{\mathrm{T}}_{\mathrm{b}}}{{\mathrm{K}}_{\mathrm{b}}}$
or $\frac{{\mathrm{W}}_2\times 1000}{{\mathrm{M}}_2\times {\mathrm{W}}_1}=\frac{\mathrm{\Delta }{\mathrm{T}}_{\mathrm{b}}}{{\mathrm{K}}_{\mathrm{b}}}$
or $\frac{5\times 1000}{{\mathrm{M}}_2\times 100}=\frac{0.954}{4.88}$
${\mathrm{M}}_2=256$
Atomic weight of sulphur = 32
Number of sulphur atom $=\frac{\mathrm{M}\mathrm{o}\mathrm{l}\mathrm{e}\mathrm{c}\mathrm{u}\mathrm{l}\mathrm{a}\mathrm{r} \text{weight}}{\mathrm{A}\mathrm{t}\mathrm{o}\mathrm{m}\mathrm{i}\mathrm{c} \text{weight}}=\frac{256}{32}=8$
Hence Molecular formula $={\mathrm{S}}_8$ .