4. A sample of ferrous oxide has the actual formula Fe0.93 O1.00. In this sample, what fraction of metal ions are Fe2+ ions? What type of non stoichiometric defect is present in this sample?
4. A sample of ferrous oxide has the actual formula Fe0.93 O1.00. In this sample, what fraction of metal ions are Fe2+ ions? What type of non stoichiometric defect is present in this sample?
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1 Answer
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4. Let the formula of sample be (Fe2+)x (Fe3+) yO
From the formula of the compound the equation can be formed as-
x+ y= 0.93 . (i)
Total positive charge on ferrous and ferric ions should balance the two units of negative charge on oxygen. Hence,
2x+ 3y= 2 . (ii)
⇒ x+ y=1. (iii)
On subtracting equation (i) from equation (iii) we have
y-y=1 - 0.93
12y=0.07
y= 0.14
On putting the value of y in equation (i)
we get, x+ 0.14 = 0.93
⇒x = 0.93 – 0.14
⇒x = 0.79
Fraction of Fe2+ ions present in the sample is = 0.81
Metal deficiency defect is found to be present i
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