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hat will bring about dissociation of a diatomic molec aving a dissociation energy of 390.4 kJ mol-¹.

hat will bring about dissociation of a diatomic molec aving a dissociation energy of 390.4 kJ mol-¹.

Chemistry
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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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?
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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