Question

The rate of a first-order reaction is followed by spectroscopy,monitoring the absorption of a colored reactant. The reactionoccurs in a 1.29-cm sample cell, and the only colored species inthe reaction has a molar absorptivity constant of 5440cm-1M-1.
A)Calculate the initial concentration of the colored reactant ifthe absorbance is 0.537 at the beginning of the reaction.
C= M

B)The absorbance falls to 0.237 within 20.2 Min . Calculate therate constant in units of s-1.

C)Calculate the half-life of the reaction. (in Sec)

D)How long does it take for the absorbance to fall to 0.131?(sec)