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Simple energy with photons problem help

  1. Feb 23, 2008 #1
    Simple energy with photons problem...help!!!

    1. The problem statement, all variables and given/known data
    What is the energy of 1.7 mol of photons that have a wavelength of 0.28 μm?

    2. Relevant equations

    3. The attempt at a solution
    E = HC/W = (6.63e^34)*(3e^8)/0.00000028 = 7.10357e^-21
    what do I do with the mol part? I know 1 mol = 6.022e^23 so I tried multiplying it by that but its wrong...do I divide. Or is there something else I have to do?
  2. jcsd
  3. Feb 23, 2008 #2
    your approach looks ok. you have 1.7 mol of photons so you have 1.7*(6.022*10^23)
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