The Energy of Light Video Lessons

Concept: The Energy of Light

# Problem: How much energy is contained in 1 mol of each of the following?1. X-ray photons with a wavelength of 0.135 nm. Express the energy numerically in kilojoules per mole.2. γ-ray photons with a wavelength of 2.75 x 10-5 nm. Express the energy numerically in kilojoules per mole

###### FREE Expert Solution

Balanced reaction: 2 HCl + Ba(OH)2 → BaCl2 + 2 H2O

where:

h = Planck’s constant (6.626 × 10–34 J • s)
v = frequency (in s–1)

where:

c = speed of light (3.0 × 108 m/s)

1. X-ray photons with a wavelength of 0.135 nm

λ = 1.35 × 10–10 m

E = 1.472 × 10–18 kJ/photon

1 mol photon = 6.022x1023 photons

E = 8.87 × 105 kJ/mole

2. γ-ray photons with a wavelength of 2.75 x 10-5 nm.

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###### Problem Details

How much energy is contained in 1 mol of each of the following?

1. X-ray photons with a wavelength of 0.135 nm. Express the energy numerically in kilojoules per mole.

2. γ-ray photons with a wavelength of 2.75 x 10-5 nm. Express the energy numerically in kilojoules per mole