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Metal deficiency defect is shown by Fe0.93O. In the crystal, some Fe2+ cations are missing and loss of positive charge is compensated by the presence of Fe3+ ions. The percentage of Fe2+ ions in the Fe0.93O crystals is _____. (Nearest integer)

1. 85
2. 86
3. 87
4. 88

Correct answer: 85

Solution

The formula Fe0.93O indicates that there are 0.93 moles of iron per mole of oxide, and since some Fe2+ ions are missing, the remaining iron must be in the form of Fe3+ to maintain charge balance. By calculating the ratio of Fe2+ to the total iron content, we find that approximately 85% of the iron is in the Fe2+ state.

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