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The work function for sodium is given in terms of kJ/mol. However, in order to calculate the energy needed to eject an electron from one sodium atom, you have to convert from kJ/mol to J/electron. Remember that with the photoelectric effect, you can think of the relationship between photons and electrons as being one photon ejects one electron. Since you want to find the energy per photon required to remove an electron from one sodium atom, you must have the work function in terms of joules needed to eject one electron, or Joules/electron. Thus, you have to multiply the work function by 10^3 to convert to Joules, and then divide by Avogadro's number (6.022 x 10^23 electrons/mol) to obtain your final value for the work function in terms of J/e.
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