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There is a unit cell of a special class of complex called a high temperature superconductor...

There is a unit cell of a special class of complex called a high temperature superconductor (HTSC). The compound is called a 1-2-3 superconductor because of the ratio of metals in the formula YBa2Cu3O7. Use this figure to verify the formula (be sure to show your work).

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There is no picture given so I tried both things structure as well as explanation

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