Problem: Despite Dalton’s laws, it is now known that many ionic compounds do not always contain atoms in small integer ratios. For example, a sample of iron(II) oxide may, in fact, contain a significant amount of Fe3+ in addition to Fe2+. This is an example of a nonstoichiometric compound. A sample of iron(II) oxide is found to be 75.01 % iron by mass.Determine the percentage of Fe3+ ions in the sample.

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FREE Expert Solution

We are asked to calculate for the percent by mass (mass %) of Fe3+ ion in a sample of iron (II) oxide which is 75.01% iron by mass . 

We’re going to use the mass percent formula shown below:


mass percent =mass componenttotal mass×100


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Problem Details

Despite Dalton’s laws, it is now known that many ionic compounds do not always contain atoms in small integer ratios. For example, a sample of iron(II) oxide may, in fact, contain a significant amount of Fe3+ in addition to Fe2+. This is an example of a nonstoichiometric compound. A sample of iron(II) oxide is found to be 75.01 % iron by mass.

Determine the percentage of Fe3+ ions in the sample.