# Problem: How much energy (in kJ) do 3.0 moles of photons, all with a wavelength of 655 nm, contain?

###### FREE Expert Solution

We’re being asked to determine how much energy (in kJ) do 3.0 moles of photons with a wavelength of 655 nm

Recall that the energy of a photon (E) is given by:

where:

h = Planck’s constant (6.626 × 10–34 J • s)

v = frequency (in s–1)

Also, recall that the frequency (v) and wavelength (λ) are related:

where:

c = speed of light (3.0 × 108 m/s)

92% (413 ratings) ###### Problem Details

How much energy (in kJ) do 3.0 moles of photons, all with a wavelength of 655 nm, contain?

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