how many moles of photons are contained in a beam of violet light (419 nm) that gives off 5.71x10-3 J of energy? Remember that E in E=hv is J per photon.   Find E using the 419 nm wavelength, ignore 5.71*10^-3 J. The E from the E=hc/l is J/photon, so is a conversion factor. 2. Start with 5.71*10^-3 J as the given, then use the E from step 1 as a conversion as well as avogadro's number to find moles

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