= Quantities, Units and Symbols in Physical Chemistry by IUPAC
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https://iupac.org/wp-content/uploads/2019/05/IUPAC-GB3-2012-2ndPrinting-PDFsearchable.pdf
IUPAC Green Book, third edition(2007), second printing(2012). Official title page identifies IUPAC and publication editors. Section2.11, printed pp.57,59: relative activity $a=\exp[(\mu-\mu^\circ)/(RT)]$ and Raoult-reference activity coefficient; section2.11.1(iv), printed pp.61–62: distinct pure-phase and solute standard states. Activities and their standard chemical potentials must use matching conventions. No individual editor identity inferred from abbreviated bylines.
Section2.11, printed p.58: reaction quotient, standard reaction Gibbs energy and standard equilibrium constant; note18 states that the equilibrium constant is dimensionless and depends on the specified standard state.
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