Question:
Calculate the percentage by weight of S if 160 grams of organic compound produce 466 grams of BaSO₄.
Calculate the percentage by weight of S if 160 grams of organic compound produce 466 grams of BaSO₄.
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When calculating percentage by weight, first find the mass of the element involved using stoichiometry and then divide by the total mass of the compound.
Updated On: Jan 14, 2026
- 20%
- 25%
- 30%
- 35%
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The Correct Option is B
Solution and Explanation
The chemical reaction for the formation of BaSO₄ is:
\[
\text{Organic compound} + BaCl_2 \rightarrow BaSO_4 + \text{Other products}.
\]
The molar mass of BaSO₄ is \( 137 + 32 + 4 \times 16 = 233 \) g/mol. From the given data, 160 grams of organic compound produces 466 grams of BaSO₄. Using stoichiometry, we can calculate the percentage by weight of sulfur (S) in the compound:
\[
\text{Percentage of S} = \frac{\text{mass of S}}{\text{mass of organic compound}} \times 100 = \frac{466}{160} \times \frac{32}{233} \times 100 = 25\%.
\]
Thus, the correct answer is option (2) 25%.
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