Question 5: Two-part question: The accuracy of a spectrophot…
Question 5: Two-part question: The accuracy of a spectrophotometer is evaluated by preparing a solution of 15.50 mg/L K2Cr2O7 (molar mass 294.18 g/mol) in 0.0050 M H2SO4, and measuring its absorbance at a wavelength of 575 nm in a cell with a path length of 1.00 cm. The measured transmittance is 0.576. a) What is the expected molar absorptivity of K2Cr2O7 at this wavelength? (Hint: Use Beer law) (8 points) b) What is the energy in Joule of the electronic transition resulting from the absorption at 575 nm?(c = 3.00 *108 m s-1; h = 6.63 *10-34 J s) (3 points)