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  • A sample of ferrous oxide has actual formula Fe_0.93 O_1.00. In this sample, what fraction of metal ions are Fe^2+ ions? What is the type of non-stoichiometric defect present in this sample?

A sample of ferrous oxide has actual formula Fe_{0.93 }O_{1.00}. In this sample, what fraction of metal ions are Fe^{2+} ions? What is the type of non-stoichiometric defect present in this sample?

Answers (1)

Let the number of O^{2-} be 100 

 Then number of Fe^{2+}=x

Number of Fe^{3+}=93-x

To maintain electrical neutrality net positive charge is equal to net negative charge 

2x+393-x=2\times 100

2x+279-3x=200

  x=79

Fe^{2+}=79

\frac{Fe^{2+}}{Fe^{2+}+Fe^{3+}}=799

=0.849

 Metal deficiency defect is present in the sample because iron is less in amount  than that required for stoichiometric composition.  

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infoexpert24

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