Question
The compound $\mathrm{Y} \mathrm{~Ba}_2 \mathrm{Cu}_3 \mathrm{O}_7$, which shows superconductivity, has copper in x oxidation state. Assume that the rare earth element yttrium is in its usual +3 oxidation state. Predict the value of $x$.
✓
Answer
1x (+3) + 2x (+ 2) + 3x + 7x (-2) = 03 + 4 + 3x - 14 = 0
3x = 7; $\text{x} = \frac{7}{3}$
3x = 7; $\text{x} = \frac{7}{3}$
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