**Dissociation of HI using Photons**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:**Questions:**(a) What is the longest wavelength (in nm) that can dissociate a molecule of HI? Input your answer: **______** nm(b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation? Input your answer: **______** J(c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)? Input your answer: **______** m/s**Table 9.2: Average Bond Energies (kJ/mol)**- **Single Bonds:** - H–H: 432 - H–F: 565 - H–Cl: 427 - H–Br: 363 - H–I: 295 - C–H: 413 - C–C: 347 - C–Si: 301 - C–N: 305 - C–O: 358 - C≡C: 839 (Multiple Bond) - C≡N: 891 (Multiple Bond) - N≡N: 945 (Multiple Bond) - etc.- **Multiple Bonds:** - C=C: 614 - C=N: 615 - C=O: 745 (799 in CO2)These values help calculate the energy required to break specific molecular bonds using photons of known wavelengths. The energy required for HI dissociation specifically refers to the single bond energy of H-I, which is 295 kJ/mol. This data can be applied to determine wavelengths and energies for photodissociation processes in chemical studies.

Answered: Image /qna-images/answer/3cb30a75-c726-493c-a489-b3ec61ead8d5.jpg

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

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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Concept explainers

Quantum Chemistry

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

**Dissociation of HI using Photons**

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:

**Questions:**

(a) What is the longest wavelength (in nm) that can dissociate a molecule of HI?
Input your answer: **______** nm

(b) If a photon of 227 nm is used, what is the excess energy (in J) over that needed for the dissociation?
Input your answer: **______** J

(c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)?
Input your answer: **______** m/s

**Table 9.2: Average Bond Energies (kJ/mol)**

- **Single Bonds:**
- H–H: 432
- H–F: 565
- H–Cl: 427
- H–Br: 363
- H–I: 295
- C–H: 413
- C–C: 347
- C–Si: 301
- C–N: 305
- C–O: 358
- C≡C: 839 (Multiple Bond)
- C≡N: 891 (Multiple Bond)
- N≡N: 945 (Multiple Bond)
- etc.

- **Multiple Bonds:**
- C=C: 614
- C=N: 615
- C=O: 745 (799 in CO2)

These values help calculate the energy required to break specific molecular bonds using photons of known wavelengths. The energy required for HI dissociation specifically refers to the single bond energy of H-I, which is 295 kJ/mol. This data can be applied to determine wavelengths and energies for photodissociation processes in chemical studies.

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