Chemistry · Mole concept, molar mass, percentage composition, empirical and molecular formulae
The composition of a sample of Wustite is O. What is the percentage of iron pres
The composition of a sample of Wustite is \( F e_{0.93} \) O. What is the percentage of iron present as \( F e^{3+} \) in total iron?
- A. \( 15.05 \% \)
- B. 25\%
- C. 35 \% \)
- D. \( 45 \% \)
Step-by-step solution
In wustite (Fe0.93O), oxide ions have a total charge of -2. Let x be the fraction of Fe ions as Fe3+ and (1-x) as Fe2+. The total positive charge from Fe ions is 0.93 × [3x + 2(1-x)] = 2. Solving: 0.93(x+2) = 2 → x+2 = 2/0.93 ≈ 2.1505 → x ≈ 0.1505 = 15.05%. Thus, 15.05% of iron is Fe3+.
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