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Question

A compound contains 3.2% of oxygen. The minimum molecular weight of the compound can be:

A
25
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B
440
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C
500
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D
1000
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Solution

The correct option is A 500
Let the minimum molecular weight of the compound be x g/mol.
It will contain at least 1 oxygen atom.
1 mole of compound contains x g which corresponds to at least 1 oxygen atom or 16 g.

We know that for minimum molecular weight, there should be only 1 oxygen atom in the compound.
So, x×3.2100=16x=500g.
Hence, the minimum molecular weight of the compound is 500 g.

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