Question

0.2 g of an organic compound is subjected to estimation of \(S\) by Carius method, giving \(0.6\) g \(BaSO_4\). Find \% of \(S\). (Nearest integer)

Answer 1

Correct Answer: 41

Concept: In Carius method, sulfur in the compound is converted into \(BaSO_4\). \[ \%\;S=\frac{32}{233}\times\frac{\text{mass of }BaSO_4}{\text{mass of compound}}\times100 \] since molar mass of \(BaSO_4=233\). Step 1: Substitute values \[ \%\;S=\frac{32}{233}\times\frac{0.6}{0.2}\times100 \] Step 2: Simplify \[ \frac{0.6}{0.2}=3 \] \[ \%\;S=\frac{32}{233}\times3\times100 \] \[ =\frac{9600}{233} \] \[ \approx 41.2 \] Step 3: Nearest integer \[ \boxed{41\%} \]