solve 20 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?

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Answered: 16. Calculate the maximum wavelength of…

16. Calculate the maximum wavelength of the radiation at will bring about dissociation of a diatomic molecule ving a dissociation energy of 390.4 kJ mol-¹.

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter18: Principles Of Chemical Reactivity: Entropy And Free Energy

Section: Chapter Questions

Problem 59GQ: Sulfur undergoes a phase transition between 80 and 100 C. S8(rhombic) S8(monoclinic) rH = 3.213...

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Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.

Question

solve 20

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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