? max 520 nm energy gap hc ? 6626 x 10 34 js2998 x 10

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between the energy levels corresponding to this transition. λ max: 520 nm Energy gap: hc/ λ = (6.626 x 10 -34 Js)(2.998 x 10 8 )/(520 x 10 -9 m) = 3.784 x 10 -19 J/photon x (6.022 x 10 23 photons/mole) x (1 KJ/1000 J) = 228 KJ/mole 3. The complexes CoF 6 3- , Co(H 2 O) 6 3+ , CoINH 3 ) 6 3+ , and Co(CN) 6 3- are green, blue-green, yellow-orange, and pale yellow respectively. Explain how this color progression is
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consistent with the crystal field splitting energies as generally predicted by the spectrochemical series in your textbook. F- is a weak field ligand with a small crystal field splitting energy and a long wavelength. Water is next in the spectrochemical series followed by NH 3 , and then CN- which is a strong field ligand that has a larger crystal field splitting energy and a shorter wavelength. And, when a compound absorbs a certain color of light, it exhibits the complementary color to the color of the absorbed light.
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