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ΔE = hc / λ

λ = hc / ΔE

ΔE = 495kJ / mol

4.95x105 / 6.023x1023 = 8.22x10-19 per atom...

λ = (3.00x108) x (6.63x10-34) / 8.22x10-19

λ = 2.41x10-7m or 241x10-9m

λ = 241nm

241nm lies in the ultraviolet region

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