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By using photons of specific wavelengths, chemists can dissociate gaseous H-I to produce H atoms with accurately known speeds. When H-I dissociates, the H atoms move away rapidly, whereas the relatively heavy I atoms move little. Average Bond Energies.
(a) What is the longest wavelength (in nm) that can dissociate a molecule of H-I? in nm.
(b) If a photon of 218 nm is used, what is the excess energy (in J) over that needed for the dissociation?
(c) If all of this excess energy is carried away by the H atom as kinetic energy, what is its speed (in m/s)?
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