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

Explanation:

The energy of a photon, E, can be calculated with the Planck-Einstein equation:

Where:

Substituting with your data:

Now multiply by Avogadro's number to obtain the energy of one mole of photons:

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .