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As typically measured, one kcal/mol represents a temperature increase of one degree Celsius in one liter of water (with a mass of 1 kg) resulting from the reaction of one mole of reagents. In SI units, one kilocalorie per mole is equal to 4.184 kilojoules per mole (kJ/mol), which comes to approximately 6.9477 × 10 −21 joules per molecule, or ...
However, the kcal is not officially part of the International System of Units (SI), and is regarded as obsolete, [2] having been replaced in many uses by the SI derived unit of energy, the joule (J), [9] or the kilojoule (kJ) for 1000 joules.
The "grand calorie" (also "kilocalorie", "kilogram-calorie", or "food calorie"; "kcal" or "Cal") is 1000 cal, that is, exactly 4184 J. It was originally defined so that the heat capacity of 1 kg of water would be 1 kcal/°C. With these units of heat energy, the units of heat capacity are 1 cal/°C = 4.184 J/K ; 1 kcal/°C = 4184 J/K.
kT (also written as k B T) is the product of the Boltzmann constant, k (or k B), and the temperature, T.This product is used in physics as a scale factor for energy values in molecular-scale systems (sometimes it is used as a unit of energy), as the rates and frequencies of many processes and phenomena depend not on their energy alone, but on the ratio of that energy and kT, that is, on E ...
kcal 15: 1.0 kcal 15 (4.2 kJ) calorie (15°C) cal-15 (g-cal-15) cal 15: 1.0 ...
Since 1 mole = 6.02214076 × 10 23 particles (atoms, molecules, ions etc.), 1 joule per mole is equal to 1 joule divided by 6.02214076 × 10 23 particles, ≈1.660539 × 10 −24 joule per particle. This very small amount of energy is often expressed in terms of an even larger unit such as the kJ·mol −1 , because of the typical order of ...
The hartree (symbol: E h), also known as the Hartree energy, is the unit of energy in the atomic units system, named after the British physicist Douglas Hartree.Its CODATA recommended value is E h = 4.359 744 722 2060 (48) × 10 −18 J [1] = 27.211 386 245 981 (30) eV.
In the Arrhenius model of reaction rates, activation energy is the minimum amount of energy that must be available to reactants for a chemical reaction to occur. [1] The activation energy (E a) of a reaction is measured in kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol). [2]