An oxygen molecule can be broken when light with a wavelength of 242 nm hits it. What is the energy of a photon of light of wavelength 242 nm? What is the frequency of the light? What type of UV light does this correspond to? If 242 nm is the maximum wavelength of light that will break an oxygen bond in O2, what is the energy needed to break the bond?â

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An important reaction in the formation of photochemical smog is the photodissociation of NO₂:

NO₂ + hν NO(g) + O(g)
The maximum wavelength of light that can cause this reaction is 420 nm. (a) In what part of the electromagnetic spectrum is light with this wavelength found? (b) What is the maximum strength of a bond, in kJ/mol, that can be broken by absorption of a photon of 420-nm light? (c) Write out the photodissociation reaction showing Lewis-dot structures.