Question

An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% sulphur is :
(atomic weight of S=32 amu)

• A. $\ce{200 \, g \, mol^{-1}}$
• B. $\ce{400\, g \, mol^{-1}}$
• C. $\ce{600 \, g \, mol^{-1}}$
• D. $\ce{300 \, g \, mol^{-1}}$

Answer 1

Answer: (B)

$\%of\, sulphur=\frac{wt\, of\, sulphur}{wt \,of \,compound}\times100=8$
$\therefore \frac{32}{wt.\, of\, compound}=\frac{8}{100} \therefore wt. \,of \,compound =400\, g\, mol^{-1}$