Question

What is the energy of one mole of photons with a wavelength of 375 nm? (h = 6.63 x 10-34 J • s, N = 6.02 x 1023)
A. 5.30 x 10-19 J
B. 2.39 x 105 J
C. 2.66 x 10-18 J
D. 5.30 x 105 J
E. 1.60 x 106 J

Answer 1

Same formula as before with a slight twist.
E = hc/wavelength gives the energy per photon. Multiply by Avogadro's number, 6.02 x 10^23 to get energy per mole of photons.