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5. To determine the concentrations (mol/L) of Co(NO3), (A) and Cr(NO3)3 (B) in an unknown sample, the following representative absorbance data were obtained. A (mol/L) B (mol/L) 510 nm 575 nm 1.5 x 10- 0.714 0.097 6 x 10-2 0.298 0.757 Unknown Unknown 0.671 0.330 Measurements were made in 1.0 cm glass cells. 1. Calculate the four molar absorptivities: &A(510)» EA(575)» EB(510) and &B(575)* 2. Calculate the molarities of the two salts A and B in the unknown.

5. To determine the concentrations (mol/L) of Co(NO3), (A) and Cr(NO3)3 (B) in an unknown sample, the following representative absorbance data were obtained. A (mol/L) B (mol/L) 510 nm 575 nm 1.5 x 10- 0.714 0.097 6 x 10-2 0.298 0.757 Unknown Unknown 0.671 0.330 Measurements were made in 1.0 cm glass cells. 1. Calculate the four molar absorptivities: &A(510)» EA(575)» EB(510) and &B(575)* 2. Calculate the molarities of the two salts A and B in the unknown.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Optical analysis problem. Please help. Thank you. 

For #1, my answers are: 4.76, 0.647, 4.97, and 12.6 in unit of L/mol cm. Please check. 

For #2, I am not sure what to do when finding 2 unknowns. 

5. To determine the concentrations (mol/L) of Co(NO3), (A) and Cr(NO3)3 (B) in an unknown sample, the following representative absorbance data were obtained. A (mol/L) B (mol/L) 510 nm 575 nm 1.5 x 10- 0.714 0.097 6 x 10-2 0.298 0.757 Unknown Unknown 0.671 0.330 Measurements were made in 1.0 cm glass cells. 1. Calculate the four molar absorptivities: &A(510)» EA(575)» EB(510) and &B(575)* 2. Calculate the molarities of the two salts A and B in the unknown.
Transcribed Image Text:5. To determine the concentrations (mol/L) of Co(NO3), (A) and Cr(NO3)3 (B) in an unknown sample, the following representative absorbance data were obtained. A (mol/L) B (mol/L) 510 nm 575 nm 1.5 x 10- 0.714 0.097 6 x 10-2 0.298 0.757 Unknown Unknown 0.671 0.330 Measurements were made in 1.0 cm glass cells. 1. Calculate the four molar absorptivities: &A(510)» EA(575)» EB(510) and &B(575)* 2. Calculate the molarities of the two salts A and B in the unknown.
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