## General Chemistry (4th Edition)

f = (3 x 10$^{8}$ ) (1.06 x 10$^{-5}$) = 2.83 x 10$^{13}$ = E hf E = (6.626 x 10$^{-34}$) x (2.83 x 10$^{13}$) = 1.88 x 10$^{-20}$ J Total Energy = Energy of 1 Photon x No. of Photons No. of Photons = Total Energy / Energy of 1 Photon = 1J / 1.88 x 10$^{-20}$ J = 5.32 x 10$^{19}$