Problem 3: Chemical Kinetics. Context: Spectroscopy is the study of the absorption and emission of light and other radiation by matter. It involves the splitting of light (or more precisely electromagnetic radiation) into its constituent wavelengths (a spectrum), which is done in much the same way as a prism splits light into a rainbow of colors. The rate of a first-order reaction is followed by this technique [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 coefficient of 5.60 x 103 M-1cm-1 at 520 nm. (a) Calculate the initial concentration of the colored reactant if the absorbance is 0.605 at the beginning of the reaction. (b) The absorbance falls to 0.250 at 30.0 min. Calculate the rate constant in units of s-1. (c) Calculate the half-life of the reaction. (d) How long does it take for the absorbance to fall to 0.100?

Problem 3: Chemical Kinetics. Context: Spectroscopy is the study of the absorption and emission of light and other radiation by matter. It involves the splitting of light (or more precisely electromagnetic radiation) into its constituent wavelengths (a spectrum), which is done in much the same way as a prism splits light into a rainbow of colors. The rate of a first-order reaction is followed by this technique [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 coefficient of 5.60 x 103 M-1cm-1 at 520 nm. (a) Calculate the initial concentration of the colored reactant if the absorbance is 0.605 at the beginning of the reaction. (b) The absorbance falls to 0.250 at 30.0 min. Calculate the rate constant in units of s-1. (c) Calculate the half-life of the reaction. (d) How long does it take for the absorbance to fall to 0.100?

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.49PAE: The rate of photodecomposition of the herbicide piclo- ram in aqueous systems was determined by...

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