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Question

0.16 g of an organic substance was heated in carius tube and sulphuric acid formed was perecipitated as BaSo4 and BaCl2. The weight of the dry BaSO4 was 0.35 g. Find the percentage of sulphur.

A
20
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B
30
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C
40
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D
50
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Solution

The correct option is B 30
Mass of organic compound = 0.16 g

Mass of = 0.35 g

Molar mass of = 233 g/mole

Molar mass of sulfur = 32 g/mole

First we have to calculate the mass of sulfur.

As, 233 g of contains = 32 g of sulfur

So, 0.35 g of contains = of sulfur

Now we have to calculate the percentage of sulfur in organic compound.


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