An organic compound contains two sulphur atoms per molecule. In a Carius estimation, 0.25 g of this compound yielded 0.466 g of barium sulphate. The molar mass of the organic compound is ______ g mol ⁻¹ . (Given molar mass of BaSO ₄ = 233 g mol ⁻¹ )

Step-by-step solution

Moles of BaSO ₄ formed = 0.466 233 = 0.002 mol . Moles of sulphur atoms in the compound = 0.002 mol . Since each molecule of the organic compound contains 2 sulphur atoms, 1 mole of the compound contains 2 moles of sulphur atoms. Moles of the organic compound = Moles of S 2 = 0.002 2 = 0.001 mol . Molar mass of the compound = Mass Moles = 0.25 0.001 = 250 g mol ⁻¹ . Answer: 250