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To the best of my knowledge I don't believe you could calculate the number of photons emitted in a light source with that equation but you could calculate the energy each photon holds. You would need to be given the number of photons for example if a problem said 4.99x10^-19J/mole all you would have to do is divide the energy by avagadros number to get the amount of energy each photon has.
the "E" in E=hv is the energy per photon, so if a question asks how many photons a light source has, as long as the question gives you (or gives you a way to find) the frequency and total energy of the light, you can use E=hv to find the energy per photon, and then divide Etotal/Eper photon to get the number of photons.
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