The rate of a first-order reaction is followed by spectroscopy, monitoring the absorbance of a colored reactant at 520 nm. The reaction occurs in a 1.00-cm sample cell, and the only colored species in the reaction has an extinction coefcient of 5.60 * 103 M-1 cm-1 at 520 nm. The absorbance falls to 0.250 at 30.0 min. Calculate the rate constant in units of s - 1.

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