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Question

A sample of wustite $${Fe}_{x}O$$ contains one $$Fe(III)$$ for every three $$Fe(II)$$. The value of $$x$$ is:


A
9/8
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B
8/9
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C
3/4
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D
4/3
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Solution

The correct option is A $$9/8$$
Let there be 1 mol of iron atom.
Amount of Fe(III)=1/4 mol
Amount of Fe(II)=3/4 mol
Total positive charges =1/4(3)+3/4(2)
= 9/4 mol (positive charge because iron have positive have in bonded state)
Let x be the amount of oxygen atoms,we have
Total negative charges =x(2) (oxygen have negative charge)
To satisfy electrical neutrality,we have
Total positive charges =Total negative charges
9/4 mol = 2x
x=9/8 mol

Chemistry

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