Percentage of cationic vacancies in Fe0.93O is
Answers
Explanation:
We know that in pure iron oxide(FeO),iron and oxygen are present in the ratio 1: 1
In wustite (Fe0.93O1.00)(Fe0.93O1.00),some of the Fe2+Fe2+ ions are missing and the number of Fe2+Fe2+ ions present in 0.93 instead of 1.
From here we find the number of missing Fe2+Fe2+ ions
⇒1.0−0.93=0.07⇒1.0−0.93=0.07
Since each Fe2+Fe2+ ion carries two units of positive charge so the total positiv charge missing
⇒0.07×2=0.14⇒0.07×2=0.14
For maintenance of electrical neutrality this much (ie 0.14) positive charge has to be compensated by the presence of Fe3+Fe3+ ions.
If one Fe3+Fe3+ ion replaces one Fe2+Fe2+ ion then there is an increase of one unit positive charge.So to compensate 0.14 unit positive charge we require 0.14 Fe3+Fe3+ ions to replace Fe2+Fe2+ ion.
So,100Fe2+100Fe2+ ions have Fe3+Fe3+ ions=0.140.930.140.93×100=15.05%×100=15.05%