Atomic Emission 2

Question

What is the total E associated with one mole of photons (a unit known as the Einstein) of 3.91x10¹⁹ Hz?

Answer 1

You are given the frequency (ν) and asked for the energy (E)

We can use the formula E = hν where h is Planck's constant of 6.626x10^-34 J-sec

E = (6.626x10^-34 J-sec)(3.91x10¹⁹ s^-1)

E = 2.59x10^-14 J ... energy per photon

To find Einsteins, multiply by Avogadro's number...

2.59x10^-14 J/photon x 6.023x10²³ photons/mole = 1.56x10¹⁰ J/mole