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An organic compound having carbon, hydrogen and sulphur contains $4 \%$ of sulphur. The minimum molecular weight of the compound is
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800
The minimum $\mathrm{m}$. wt. must contain at least one S atom.
$\begin{array}{rl}
\therefore \quad \% & \mathrm{~S}=\frac{\text { weight of one } \mathrm{S}-\text { atom }}{\text { minimum } \mathrm{m} . \mathrm{wt}} \times 100 \\
& 4=\frac{32}{\text { minimum } \mathrm{m} . \mathrm{wt} .} \times 100 \\
& \text { minimum } \mathrm{m} . \text { wt. }=\frac{32}{4} \times 100=800
\end{array}$
$\begin{array}{rl}
\therefore \quad \% & \mathrm{~S}=\frac{\text { weight of one } \mathrm{S}-\text { atom }}{\text { minimum } \mathrm{m} . \mathrm{wt}} \times 100 \\
& 4=\frac{32}{\text { minimum } \mathrm{m} . \mathrm{wt} .} \times 100 \\
& \text { minimum } \mathrm{m} . \text { wt. }=\frac{32}{4} \times 100=800
\end{array}$
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