Question

What is the energy of 0.500 mol of 355 nm photons in kj/mol?

Answer 1

Use Planck's relation:
\[E=h*v\]
E: Energy
h: Planck's constant
v: the frequency

Use the relation between frequency and wavelength in order to rewrite the equation (use the speed of light (c) as velocity)

Then you find the energy for 1 photon. Do the rest of the calculation your self from here by using Avogadro constant.

Answer 2

Thanks, man!