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Question

A substance contains 0.25% iron by weight. The molecular mass of the substance is 89600. The number of iron atoms per molecule of the substance is :

A
5
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B
4
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C
3
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D
2
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Solution

The correct option is B 4

The compound contains 0.25% Iron.

The molecular mass of the compound= 89600 g/mole.

Hence mass of Iron in the compound.

=0.25100×89600=224g.

The atomic mass of Iron = 56g.

Hence, no. of iron atoms in the compound=22456=4 atoms.

Hence option B is correct.


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