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There are two steps in the extraction of copper metal from chalcocite, a copper ore. In...

There are two steps in the extraction of copper metal from chalcocite, a copper ore. In the first step, copper(I) sulfide and oxygen react to form copper(I) oxide and sulfur dioxide: 2 Cu 2 S ( s ) + 3 O 2 ( g ) → 2 Cu 2 O ( s ) + 2 SO 2 ( g )

In the second step, copper(I) oxide and carbon react to form copper and carbon monoxide: Cu 2 O ( s ) + C ( s ) → 2 Cu ( s ) + CO ( g ) Suppose the yield of the first step is 86. % and the yield of the second step is 76. % .

Calculate the mass of oxygen required to make 7.0 kg of copper. Be sure your answer has a unit symbol, if needed, and is rounded to 2 significant digits.

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