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The following information is to be used for the next two questions. Molar absorptivity data for...

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Chemistry

The following information is to be used for the next twoquestions. Molar absorptivity data for the cobalt and nickelcomplexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.514-gsample was dissolved and diluted to 150.0 mL. A 25.0-mL aliquot wastreated to eliminate interferences; after addition of2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. Thissolution had an absorbance of 0.693 at 510 nm and 0.289 at 656 nmin a 1.00-cm cell.

Calculate the concentration of cobalt (in ppm) in the initialsolution prepared by dissolving the sample.

Calculate the concentration of nickel (in ppm) in the initialsolution prepared by dissolving the sample.

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