2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) ɛa (M'cm-l) 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample.

2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) ɛa (M'cm-l) 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.

Question

2. The molar absorptivity of compound A & B were measured with pure solutions as follows:
wavelength (nm)
Ea (M'cm-')
2139
EB (M-'cm-')
8469
312
417
10892
4325
(a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the
greatest frequency? What wavelength has the greatest energy (show your calculation)?
(b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312
nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample.
3. Given the molar absorptivity of a pH indicator at 525 nm is 16884 M-'cm for In and
1125 M-'cm- for HIn, calculate the pKa of the indicator if the absorbance of a 8.40 X 105
M solution of the indicator at pH 5.48 is 0.412 using a 1.00 cm cell.

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