It takes 208.4 kJ of energy to remove 1 mole of electrons from 1 mole of atoms on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom on the surface of solid rubidium in Joules?

Question

What is the maximum wavelength of light capable of doing this in nanometers?

Answer 1

208,400/6.022E23 = Energy/atom.
Eatom = hc/wavelength. Solve for wavelength, in meters, and convert to nm.