jee main chemistry important questions | Purification And Characterization Of Organic Compounds

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Topic Question Set

Q 11 :

In an estimation of sulphur by Carius method 0.2 g of the substance gave 0.6 g of ${BaSO}_{4}$ . The percentage of sulphur in the substance is _______ %.

(Given molar mass in ${g mol}^{- 1}$ $S : 32$ , ${BaSO}_{4} : 231$ ) [2026]

(42)

$Number of moles of S in organic compound$

$= {number of moles of BaSO}_{4}$

$= \frac{{Given mass of BaSO}_{4}}{{Molar mass of BaSO}_{4}} = (\frac{0.6}{231}) mol$

$Mass of sulphur in organic compound$

$= moles of S \times molar mass of S = (\frac{0.6}{231}) \times 32 g$

$Mass percentage of S in organic compound$

$= \frac{Mass of S}{Mass of organic compound} \times 100$

$= \frac{0.6 \times 32}{231 \times 0.2} \times 100 = 41.56 % ≃ 42 %$

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