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The bond dissociation energy of H is 430.53 kJ molb9. When hydrogen is split by exposure to radiation of wavelength 253.7 nm, what percentage of the incident radiant energy is transformed into kinetic energy?
- 100%
- 8.76%
- 2.22%
- 1.22%
Correct answer: 8.76%
Solution
The percentage of incident radiant energy transformed into kinetic energy is calculated by comparing the energy of the absorbed photons to the bond dissociation energy. The energy of the photons at the given wavelength is lower than the bond dissociation energy, resulting in a percentage of about 8.76% being converted into kinetic energy.
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