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Question

An organic compound on analysis was found to contain 0.032% of sulphur. The molecular mass of the compound, if its molecule contains two sulphur atoms is:

A
200
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B
2000
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C
20000
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D
200000
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Solution

The correct option is D 200000
Organic compound contains 0.032% of sulphur by mass.

Let the molecular mass of compound be 'X.

Atomic mass of sulphur - 32g

Atomic mass of 2 sulphur atoms = 32×2 = 64gm

weight of sulphur in compound = percentage of sulphur × total molecular weight of compound
64gm = 0.032% ×X = 0.032100×X
X=64×1000.032 = 200000gm

The molecular weight of the compound is 200000gm.

Hence,option D is correct answer.

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