A colored dye compound decomposes to give a colorless product. The original dye absorbs at 608 nm and has an extinction coefficient of 4.7 × 104 M-1 cm-1 at that wavelength. You perform the decomposition reaction in a 1-cm cuvette in a spectrometer and obtain the following data:
Time (min) Absorbance at 608 nm
0..................................1.254
30.................................0.941
60.................................0.752
90.................................0.672
120...............................0.545
From these data, determine the rate law for the reaction "dye → product" and determine the rate constant?