A spectrophotometer was calibrated with a 52times10-4 m in, Ask an Expert

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A spectrophotometer was calibrated with a 5.2×10^-4 M (in Cu) Cu-neocuproine solution. This calibration was carried out in a 1.00 cm cell, and yielded an absorbance of 0.215 AU. An unknown was then analyzed in this same spectrophotometer, but using a 2.50 cm cell. If the absorbance of the unknown was 0.222 AU, what is the Cu concentration?

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