What is the energy in joules of a mole of photons associated with red light of wavelength 7.00 × 10² nm? A)4.72 × 10^-43 J B)1.71 × 10⁵ J C)12.4 kJ D)256 kJ E)2.12 × 10⁴² J

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Quizplus · Accepted Answer

The energy of a photon is given by E = hc/λ, where h is Planck's constant (6.626 × 10^-34 J·s), c is the speed of light (3.00 × 10^8 m/s), and λ is the wavelength in meters. For a mole of photons, multiply by Avogadro's number (6.022 × 10^23 mol^-1). Converting 700 nm to meters and calculating gives approximately 1.71 × 10^5 J.

What Is the Energy in Joules of a Mole of Photons