10.16. Calculate the maximum wavelength of the radiation hat will bring about dissociation of a diatomic molecule having a dissociation energy of 390.4 kJ mol-¹.
10.16. Calculate the maximum wavelength of the radiation hat will bring about dissociation of a diatomic molecule having a dissociation energy of 390.4 kJ mol-¹.
Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter10: Entropy And The Second Law Of Thermodynamics
Section: Chapter Questions
Problem 10.56PAE: Describe why it is easier to use Gto determine the spontaneity of a process rather than S u
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Transcribed Image Text: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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