An ore of iron, wustite, is analyzed and found to have the non-stoichiometric formula . What is the — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Let the number of $Fe^{3+}$ ions be $y$ . The number of $Fe^{2+}$ ions is $0.93 - y$ . To maintain electrical neutrality in the crystal, the total positive cationic charge must exactly equal the $-2$ charge of oxygen. Therefore, $3y + 2(0.93 - y) = 2 \Rightarrow y + 1.86 = 2 \Rightarrow y = 0.14$ . The mole fraction of $Fe^{3+}$ among all iron atoms is $0.14 / 0.93 \approx 0.1505$ .