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Question 1.7.2.2: 1.0 g of a coal sample was used in a bomb calorimeter for th......

1.0 g of a coal sample was used in a bomb calorimeter for the determination of calorific value. Calorific value of coal was found to be 8800 cal/g. The ash formed in the bomb calorimeter was extracted with acid and the acid extract was heated with BaCl_{2} solution and a precipitate of BaSO_{4} was obtained. The precipitate was filtered, dried and weighed. The weight of precipitate was found to be 0.08 g. Calculate the percentage of sulphur in the coal sample.

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Percentage of sulphur = \frac{ weight  of  BaSO_{4}  ppt  obtained \times 32 \times 100}{ 233 \times weight  of  coal  sample  taken}
=\frac{0.08\times 32 \times 100}{233\times 1}= 1.0987%
Percentage of sulphur = 1.0987%

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