The abundance of ozone is typically inferred from measurements of UV absorption and is often expressed in terms of Dobson units: 1 DU is equivalent to a layer ofpure ozone 103 cm thick at 1 atm and 0°C. Given a molar absorption coefficient of 476 dm³ mol 1 cm 1, compute the absorbance of UV radiation for the ozonevalues shown below.(a) 320. DU (a typical value)mol-14.015.2x(b) 150. DU (a value reached during seasonal Antarctic ozone depletions)

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Answered: The abundance of ozone is typically…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 6P

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Discuss how X-rays suitable for macromolecular studies are generated “in-house”. What are the advantages of using synchrotron radiation for macromolecular studies?
3. ^14N^16O (the superscripts represent the atomic mass number) (a) NO molecules rotate at an angular velocity of 2.01x10^12 rev/s, at the quantized rotational state with the rotational quantum number J of 3. Calculate the bond length of NO molecules. (b) Can NO molecules rotate under light irradiation? Explain your answer. (c) Calculate the effective force constant of the vibrational mode of NO at a frequency of 5.63x10^13 Hz measured by the infrared absorption spectrum. (d) NO has a bond energy of 6.29 eV. Applying the parabolic approximation to estimate the longest distance in which N and O atoms can be stretched before the dissociation of the molecular bond
The molar absorption coefficient of a substance dissolved in hexane is known to be 723 dm3 mol−1 cm−1 at 260 nm. Calculate the percentage reduction in intensity when ultraviolet radiation of that wavelength passes through 2.50 mm of a solution of concentration 4.25 mmol dm−3.
When ultraviolet radiation of wavelength 400 nm passes through 2.50 mm of a solution of an absorbing substance at a concentration 0.717 mmol dm−3, the transmission is 61.5 per cent. Calculate the molar absorption coefficient of the solute at this wavelength. Express your answer in square centimetres per mole (cm2 mol−1).
A C¬D (carbon–deuterium) bond is electronically much like a C¬H bond, and it has a similar stiffness, measured bythe spring constant, k. The deuterium atom has twice the mass (m) of a hydrogen atom, however.(a) The infrared absorption frequency is approximately proportional to 1k>m, when one of the bonded atoms is muchheavier than the other, and m is the lighter of the two atoms (H or D in this case). Use this relationship to calculate theIR absorption frequency of a typical C¬D bond. Use 3000 cm-1as a typical C¬H absorption frequency.(b) A chemist dissolves a sample in deuterochloroform (CDCl3) and then decides to take the IR spectrum and simplyevaporates most of the CDCl3. What functional group will appear to be present in this IR spectrum as a result of theCDCl3 impurity?
Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. Note: Reference the Fundamental constants and Unit conversions for derived SI units tables for additional information, Part 1 of 2 A molecular vibration absorbs radiation of wavelength 219. um. What frequency corresponds to that wavelength? Round your answer to 3 significant figures. 0.9 X G Part 2 of 2 A molecular vibration has a frequency of vibration of 9,490x 10 Hz. What wavelength corresponds to that frequency? Round your answer to 4 significant figures. um of Save For Later 141 Submit Assignment
Explain the difference between the excitation and emission spectra of a molecule such as anthracene.
Radiation of wavelength 268 nm passed through 1.5 mm of a solution that contained benzene in a transparent solvent at a concentration of 0.080 mol dm-3 . The intensity of the radiation is reduced to 22 per cent of its initial value (so T = 0.22). (a) Calculate the absorbance and the molar absorption coefficient of the benzene. (b) What would be the transmittance through a cell of thickness 3.0 mm?
An aqueous solution of a triphosphate derivative of molar mass 502 g mol-1, was prepared by dissolving 17.2 mg in enough water to make 500 cm3 of solution and a sample was transferred to a cell of length 1.00 em. The absorbance was measured as 1.011. Calculate (a) the molar absorption coefficient;(b) the transmittance. expressed as a percentage.for a solution of twice the concentration.
By how many joules is the energy of a molecule increased when it absorbs (a) visible light with a wavelength of 500 nm or (b) infrared radiation with a wavenumber of 1 251 cm-1?
Ozone formation in the troposphere involves the following steps: (1) NO₂(e) → NO(g) + O(g) (2) 0(e) + 0₂(g) → 0, (e) The first step is initiated by the absorption of visible light. Calculate the longest wavelength required for step 1 at 25.0 "C. Round your answer to 4 significant digits. Note: Reference the Fundamental constants and Thermodynamic properties of pure substances tables for additional Information. λ= nm O D
Be sure to answer all parts. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. (a) A molecular vibration absorbs radiation of wavelength 28.3 um. What frequency (in s) corresponds to that wavelength? Enter your answer in scientific notation. x 10 (b) A molecular vibration has a frequency of vibration of 7.574 x 10" Hz. What wavelength (in um) corresponds to that frequency? um

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