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# Atomic Model: Beer's Law for Determining Concentration

APCHEM-AOJAIX

Which of the following is the concentration of a cobalt (II) nitrate solution whose absorbance was measured at 0.55 in a 1.1 cm cuvette with a molar extinction coefficient of 1.5/M $\cdot$ cm?

A

0.30 M

B

0.60 M

C

0.90 M

D

1.2 M