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In physics, ionization energy is usually expressed in electronvolts (eV) or joules (J). In chemistry, it is expressed as the energy to ionize a mole of atoms or molecules, usually as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol).
1 eV/particle (electron volt / particle) is equal to 96,491.56663707591 J/mol (joule per mole). To convert from electron volt / particle to joule per mole, multiply by 96,491.56663707591 or divide by 0.0000103636.
One mole of particles given 1 eV of energy each has approximately 96.5 kJ of energy – this corresponds to the Faraday constant (F ≈ 96 485 C⋅mol −1), where the energy in joules of n moles of particles each with energy E eV is equal to E·F·n.
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We related the energy of a photon to its frequency and wavelength using the Planck-Einstein relation: E = hν = hc λ. In 3.091, the most common units we will use for energy are joules (J) or electron volts (eV). A joule is equivalent to a kg × m2 s2, which is like a force integrated over a distance.
30 Ιαν 2023 · The energies of electrons in molecular orbitals can be observed directly by measuring the ionization energy. This is the energy required to remove an electron, in this case, from a molecule.
