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Calculate the energy in Joules of a photon from which red light has frequency 4 x 1014 Hz. What is the energy if there is 1 mole of photons?

Answer:

                E = hv

E = (6.626 x 10-34 J s) x (4 x 1014 Hz)

E = 26,5 x 10-20 J

Photon Energy 26,5 x 10-20 J times 1 mole of the photons (avogadro’s number = 6,02 x 1023)

E with 1 mole of photons = 26,5 x 10-20 J x 6,02 x 1023 mol-1

= 159,53 x 103

= 159 x 103

= 1,59 x 105