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(1) A sample containing 0.0250 M concentration of a dye in a cell of 1 cm2 cross section has a measured absorbance of 1.012 at 650 nm. Calculate the instrumental constant "k" for the spectrophotometer at that wavelength. (2) A sample of the same dye in the same cell and spectrophotometer has a measured absorbance of 0.672 at the same wavelength. Calculate the dye concentration. (3) 5.00 mL of 0.00500 M ferric nitrate is added to 5.00 mL of nitric acid and 10.0 mL of 0.00250 M thiocyanate solution. Calculate the initial Fe3+ concentration before reaction.

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