The Sulfur Content of an Ore Is Determined Gravimetrically by Reacting

question 15

Multiple Choice

The sulfur content of an ore is determined gravimetrically by reacting the ore with concentrated nitric acid and potassium chlorate,converting all sulfur to sulfate.The excess nitrate and chlorate is removed by reaction with concentrated hydrochloric acid and the sulfate is precipitated using barium cation. Ba²⁺ (aq) + SO₄^2- (aq)  BaSO₄ (s)
Analysis of 10.1830 grams of a sulfur containing ore yielded 13.0221 grams of BaSO₄.What is the percent by mass sulfur in the ore? (BaSO₄ = 233.43 g/mol)

• A)32.18%
• B)52.63%
• C)10.74%
• D)17.57%
• E)The answer cannot be calculated with available data.

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