Time Absorbance  Concentration 60 0.223 0.0130 180 0.198 0.0115 300 0.206 0.0120 480 0.171 0.0099 660 0.13 0.0076 900 0.122 0.0071 1200 0.09 0.0052 1500 0.107 0.0062 2100 0.046 0.0027 ε is the molar extinction coefficient (17.2 M-1 cm-1), b is the pathlength (1 cm) Slope of the most linear graph: y = -0.0007x - 4.2935 Find the rate constant for this reaction using slope of the linear graph with brief steps.

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