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By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Use Table 9.2 in your textbook to answer the following questions: (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? nm (b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation? 4.0 (c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? 4.0 m/s Aueago Rend Enoxgios (ll (mel)

By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Use Table 9.2 in your textbook to answer the following questions: (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? nm (b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation? 4.0 (c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? 4.0 m/s Aueago Rend Enoxgios (ll (mel)

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter7: Chemical Bonding And Molecular Structure
Section: Chapter Questions
Problem 7.102PAE
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By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Use Table 9.2 in your textbook to answer the following questions: (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? 4.0 nm (b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation? 4.0 (c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? 4.0 m/s Average Bond Energies (kJ/mol) Bond Energy Bond Energy Bond Energy Bond Energy Single Bonds H-H 432 N-H 391 Si-H 323 S-H 347 H-F 565 N-N 160 Si-Si 226 S-S 266 H-CI 427 N-P 209 Si-O 368 S-F 327 Н-Br 363 N-O 201 Si-S 226 S-CI 271 H-I 295 N-F 272 Si-F 565 S-Br 218 N-CI 200 Si-CI 381 S-I ~170 310 234 C-H 413 N-Br 243 Si-Br C-C 347 N-I 159 Si- F-F 159 C-Si 301 F-CI 193 305 0-H 467 P-H 320 F-Br 212 C-O 358 0-P 351 P-Si 213 F-I 263 С—Р 264 0-0 204 Р—Р 200 Cl-CI 243 C-S 259 0-S 265 P-F 490 Cl-Br 215 C-F 453 0-F 190 P-CI 331 Cl-I 208 C-CI 339 0-CI 203 P-Br 272 Br-Br 193 С—Br 276 0-Br 234 P-I 184 Br-I 175 216 0-I 234 I-I 151 Multiple Bonds C=C 614 N=N 418 C=C 839 N=N 945 C=N 615 N=0 607 C=N 891 C=0 745 O2 498 C=0 1070 (799 in CO2) Table 9.2
Transcribed Image Text:By using photons of specific wavelengths, chemists can dissociate gaseous HI to produce H atoms with accurately known speeds. When HI dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Use Table 9.2 in your textbook to answer the following questions: (a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? 4.0 nm (b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation? 4.0 (c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? 4.0 m/s Average Bond Energies (kJ/mol) Bond Energy Bond Energy Bond Energy Bond Energy Single Bonds H-H 432 N-H 391 Si-H 323 S-H 347 H-F 565 N-N 160 Si-Si 226 S-S 266 H-CI 427 N-P 209 Si-O 368 S-F 327 Н-Br 363 N-O 201 Si-S 226 S-CI 271 H-I 295 N-F 272 Si-F 565 S-Br 218 N-CI 200 Si-CI 381 S-I ~170 310 234 C-H 413 N-Br 243 Si-Br C-C 347 N-I 159 Si- F-F 159 C-Si 301 F-CI 193 305 0-H 467 P-H 320 F-Br 212 C-O 358 0-P 351 P-Si 213 F-I 263 С—Р 264 0-0 204 Р—Р 200 Cl-CI 243 C-S 259 0-S 265 P-F 490 Cl-Br 215 C-F 453 0-F 190 P-CI 331 Cl-I 208 C-CI 339 0-CI 203 P-Br 272 Br-Br 193 С—Br 276 0-Br 234 P-I 184 Br-I 175 216 0-I 234 I-I 151 Multiple Bonds C=C 614 N=N 418 C=C 839 N=N 945 C=N 615 N=0 607 C=N 891 C=0 745 O2 498 C=0 1070 (799 in CO2) Table 9.2
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