How many moles of are needed to react with of ? (Note: is mixed oxide, only oxidizes). — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
How many moles of $K_2Cr_2O_7$ are needed to react with $1 \text{ mole}$ of $Fe_2O_4$? (Note: $Fe_2O_4$ is $Fe^{2+}Fe^{3+}_2O_4$ mixed oxide, only $Fe^{2+}$ oxidizes).
Answer: 0.167
💡 Solution & Explanation
In $1 \text{ mole } Fe_3O_4$, there is $1 \text{ mole } Fe^{2+}$. <br>Ratio $K_2Cr_2O_7 : Fe^{2+} = 1 : 6$. <br>$\text{moles} = 1/6 \approx 0.167 \text{ mol}$.
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