# A light emitting diode (L.E.D.) emits photons with an energy of 2.84 xx 10^-19 J. What is the energy per mole of photons emitted?

Dec 29, 2017

Just as a dozen is twelve of anything, so a mole is Avogadro's number = 6.02×10^{23} of anything. So the energy of the given light beams may be rendered as
(2.84×10^{-19}"J")×({6.02×10^{23}}/{"mole"})=1.71×10^5{"J"}/{"mole"}.