Electronic Structure of Atoms

74) (a) h = 6.63 x 10^-34 J•s          c = 3.00 x 10⁸ m/s          E = 2.00 x 10⁵ J/mol

               E = 2.00 x 10⁵ J/mol photons * 1 mol photons/(6.02 x 10²³ photons) = 3.32 x 10^-19 J/photon

      (b) E = hc/wlength

            wlength = hc/E = 6.63 x 10^-34 J•s * 3.00 x 10⁸ m/s/(3.32 x 10^-19 J/photon) = 6.00 x 10^-7 m

      (c) wlength = 6.00 x 10^-7 m * 109 nm/m = 600 nm

           This wavelength corresponds to yellow light in the electromagnetic spectrum. Red light has wavelengths about 700 nm and does not transfer enough energy to initiate electron transfer.