https://doi.org/10.1351/goldbook.E02142
The standard is the , where denotes the ). The quantity is the standard is the the absolute temperature, the the on the symbol are often omitted. The symbol is frequently (but incorrectly) written , where the standard symbol is omitted and the is placed after the .
enthalpy
of activation
enthalpy
change that appears in the thermodynamic form of the rate equation obtained from conventional transition state theory
. This equation is only correct for a first order reaction, for which the rate constant
has the dimension reciprocal time. For a second order reaction, for which the rate constant
has the dimension (reciprocal time) × (reciprocal concentration), the left hand side should be read as standard concentration
(usually entropy of activation
, and care must be taken with standard states. In this equation Boltzmann constant
, Planck constant
, and gas constant
. The enthalpy
of activation
is approximately equal to the activation energy
; the conversion of one into the other depends on the molecularity
. The enthalpy
of activation
is always the standard quantity, although the word standard and the superscript Sources:
Green Book, 2nd ed., p. 56 [Terms] [Book]
PAC, 1993, 65, 2291. (Nomenclature of kinetic methods of analysis (IUPAC Recommendations 1993)) on page 2294 [Terms] [Paper]
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1113 [Terms] [Paper]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 164 [Terms] [Paper]
Green Book, 2nd ed., p. 56 [Terms] [Book]
PAC, 1993, 65, 2291. (Nomenclature of kinetic methods of analysis (IUPAC Recommendations 1993)) on page 2294 [Terms] [Paper]
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1113 [Terms] [Paper]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 164 [Terms] [Paper]