A solution of KMnO₄ absorbs light at 540 nm (page 206). What is the frequency of the light absorbed? What is the energy of one mole of photons with λ = 540 nm?

Data given on Page 206

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Absorbance 1.0 0.8 0.6 0.4 0.2 Curve 1 Curve 2 0.0 400 450 500 550 600 650 700 X,nm Figure 4.17 The absorption spectrum of solutions of potas- sium permanganate (KMnO4) at different concentrations. The solu- tion for curve 1 has a higher con- centration than that for curve 2.