Question

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

Answer 1

`E=1.56* 10^(10)J`

Step-by-step explanation:

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

`E=hf`

Where:

• h is Planck's constant 6.626×10⁻³⁴ J.s, and

• f is the frequency of the photon or electromagnetic radiation.

Substituting with your data:

`E=6.626* 10^(-34)J.s* 3.91* 10^(19)s^(-1)=2.5908* 10^(-14)J`

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

`E=2.5908* 10^(-14)J* 6.022* 10^(23)=1.56* 10^(10)J`