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Chemistry Question on Stoichiometry and Stoichiometric Calculations

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

200 g mol−1{200 \, g \, mol^{-1}}

B

400 g mol−1{400\, g \, mol^{-1}}

C

600 g mol−1{600 \, g \, mol^{-1}}

D

300 g mol−1{300 \, g \, mol^{-1}}

Answer

400 g mol−1{400\, g \, mol^{-1}}

Explanation

Solution

%of sulphur=wt of sulphurwt of compound×100=8\%of\, sulphur=\frac{wt\, of\, sulphur}{wt \,of \,compound}\times100=8
∴32wt. of compound=8100∴wt. of compound=400 g mol−1\therefore \frac{32}{wt.\, of\, compound}=\frac{8}{100} \therefore wt. \,of \,compound =400\, g\, mol^{-1}