solve 19 Photochemistry and RadiationChemistry10.16. Calculate the maximum wavelength of the radiationat will bring about dissociation of a diatomic moleculehaving a dissociation energy of 390.4 kJ mol¹.10.17. Hydrogen iodide undergoes decomposition intoH₂ + 1₂ when irradiated with radiation having a wavelengthof 207 nm. It is found that when 1 J of energy is absorbed,440 μg of HI is decomposed. How many molecules of HIare decomposed by 1 photon of rad tionthis wave-length? Suggest a mechanism that is consistent with thisresult.10.18. A 100-watt mercury-vapor lamp emits radiation of253.7 nm wavelength and may be assumed to operate with100% efficiency. If all the light emitted is absorbed by asubstance that is decomposed with a quantum yield ofnity, how long will it take for 0.01 mol to bedecomposed?10.19. Suppose that the radiation emitted by the lamp inProblem 10.18 is all absorbed by ethylene, whichdecomposes into C₂ H₂ + H₂ with a quantum yield ofunity. How much ethyne will be produced per hour?10.20. A 1000-watt mercury vapor flash lamp emitsradiation of 253.7 nm wavelength, and the duration of theflash is 1 us. Suppose that all of the radiation of a singleflash is absorbed by mercury vapor; how many atoms ofexcited mercury are formed?

Answered: 10.16. Calculate the maximum wavelength…

10.16. Calculate the maximum wavelength of the radiation ñat will bring about dissociation of a diatomic molecule having a dissociation energy of 390.4 kJ mol-¹.

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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Question

solve 19

Photochemistry and Radiation
Chemistry
10.16. Calculate the maximum wavelength of the radiation
at will bring about dissociation of a diatomic molecule
having a dissociation energy of 390.4 kJ mol¹.
10.17. Hydrogen iodide undergoes decomposition into
H₂ + 1₂ when irradiated with radiation having a wavelength
of 207 nm. It is found that when 1 J of energy is absorbed,
440 μg of HI is decomposed. How many molecules of HI
are decomposed by 1 photon of rad tion
this wave-
length? Suggest a mechanism that is consistent with this
result.
10.18. A 100-watt mercury-vapor lamp emits radiation of
253.7 nm wavelength and may be assumed to operate with
100% efficiency. If all the light emitted is absorbed by a
substance that is decomposed with a quantum yield of
nity, how long will it take for 0.01 mol to be
decomposed?
10.19. Suppose that the radiation emitted by the lamp in
Problem 10.18 is all absorbed by ethylene, which
decomposes into C₂ H₂ + H₂ with a quantum yield of
unity. How much ethyne will be produced per hour?
10.20. A 1000-watt mercury vapor flash lamp emits
radiation of 253.7 nm wavelength, and the duration of the
flash is 1 us. Suppose that all of the radiation of a single
flash is absorbed by mercury vapor; how many atoms of
excited mercury are formed?

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