1. The problem statement, all variables and given/known data It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength of light capable of doing this? 2. Relevant equations Ephotons=hc/lambda 3. The attempt at a solution I don't know the energy of the photon. I know h=6.626e-34, c=2.9979e8 I'm trying to find lambda but w/o the Ephoton I don't how to solve the equation.I found the energy to remove a single electron which is 3.461e-19.