Im not sure how to answer this question

Question

Determine the energy of 1.90 mol of photons for visible light (595 nm).

Answer 1

First, we will find the energy from a single photon of light that has a wavelength of 595 nm. We will then convert that to the energy for a mole of those same photons.

E =hc / λ

E = energy of 1 photon = ?

h = Planck's constant = 6.626x10^-34 Js

c = speed of light = 3x10⁸ m/s

λ = wavelength in m = 595x10^-9 m (since 1 nanometer = 1x10^-9 meters)

E = ( 6.626x10^-34 Js)(3x10⁸ m/s) / 595x10^-9 m

E = 3.34x10^-19 J / photon

How many photons are in 1 mole of photons? Answer: Avogadro's number = 6.022x10²³ photons/mol

3.34x10^-17 J / photon x 6.022x10²³ photons / mol photons x 1.90 mols photons = 3.82x10⁷ J

(be sure to check the math)