Question 9: (8 points) Given the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3 (B) in an unknown sample, the following absorbance data were obtained. Molarity of A (mol/L) Molarity of B (mol/L) Absorbance at 510 nm Absorbance at 575 nm 0.35 0.115 0.0 0.814 0.0 0.26 0.198 0.857 Unknown Unknown 0.571 0.430 Measurements were made in 1.0 cm glass cells. 9.1. (4 points) Calculate the four molar absorptivities, &A (510), EA (575), EB (510) and EE (575) Please show all your calculation to get full credits. 9.2. (4 points) Calculate the molarities of the two salts A and B in the unknown solution. Please show all your calculation to get full credits