The first substance to act as a superconductor above the, Chemistry

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The first substance to act as a superconductor above the

The first substance to act as a superconductor above the temperature of liquid nitrogen (77 K) has the approximate formula YBa2Cu3O7. Explain what is the percent by mass of Cu in this compound? symbol "Y" is not a typo error it is actually a symbol for a genuine element.

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Chemistry: The first substance to act as a superconductor above the

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