Joule per mole

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The joule per mole (symbol: J·mol−1 or J/mol) is the unit of energy per amount of substance in the International System of Units (SI), such that energy is measured in joules, and the amount of substance is measured in moles.

It is also an SI derived unit of molar

thermodynamic energy defined as the energy equal to one joule in one mole of substance.[1][2] For example, the Gibbs free energy of a compound in the area of thermochemistry is often quantified in units of kilojoules per mole (symbol: kJ·mol−1 or kJ/mol), with 1 kilojoule = 1000 joules.[3]

Physical quantities measured in J·mol−1 usually describe quantities of energy transferred during phase transformations or chemical reactions. Division by the number of moles facilitates comparison between processes involving different quantities of material and between similar processes involving different types of materials. The precise meaning of such a quantity is dependent on the context (what substances are involved, circumstances, etc.), but the unit of measurement is used specifically to describe certain existing phenomena, such as in thermodynamics it is the unit of measurement that describes molar energy.[4]

Since 1 mole =

enthalpy of reaction in units of kJ·mol−1.[6]

Other units sometimes used to describe reaction energetics are

wavenumbers in inverse centimeters (cm−1). 1 kJ·mol−1 is approximately equal to 1.04×10−2 eV per particle, 0.239 kcal·mol−1, or 83.6 cm−1. At room temperature (25 °C, or 298.15 K
) 1 kJ·mol−1 is approximately equal to 0.4034 .

References

  1. ^ "What does Joule per Mole mean? Definition, meaning and sense". www.tititudorancea.com. Retrieved 2020-06-05.
  2. ^ "Calorimetry and Molar Enthalpy". Retrieved 2021-03-05.
  3. ^ "Units in Thermochemical Calculations – AP Central | College Board". apcentral.collegeboard.org. Retrieved 2023-05-21.
  4. ISBN 978-1-84755-582-3
    .
  5. ISBN 978-0201380279
    .
  6. ^ "5.4: Enthalpy of Reaction". Chemistry LibreTexts. 2014-11-18. Retrieved 2023-05-21.
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