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How Thermodynamic Data and Equilibrium Constants Changed When the Standard-State Pressure Became 1 Bar
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Abstract
In 1982 the IUPAC recommended that the pressure used to define the standard state of a substance be changed from 1 atm to 1 bar. The principal effect of the change is a slight increase in the entropy and a slight decrease in the free energy of any gas.
Keywords (Audience):
Second-Year UndergraduateKeywords (Domain):
Physical ChemistryKeywords (Subject):
ThermodynamicsCiting Articles
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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Understanding Chemical Equilibrium Using Entropy Analysis: The Relationship Between ΔStot(syso) and the Equilibrium Constant
Thomas H. BindelJournal of Chemical Education2010 87 (7), 694-699Understanding Chemical Equilibrium Using Entropy Analysis: The Relationship Between ΔStot(syso) and the Equilibrium Constant
Thomas H. BindelJournal of Chemical Education2010 87 (7), 694-699Entropy analyses as a function of the extent of reaction are presented for a number of physicochemical processes, including vaporization of a liquid, dimerization of nitrogen dioxide, and the autoionization of water. Graphs of the total entropy change ...

The Right Shift? A Problem in Chemical Equilibrium
António Ferrer Correia , João C. M. Paiva , Victor M. S. GilJournal of Chemical Education2002 79 (5), 583The Right Shift? A Problem in Chemical Equilibrium
António Ferrer Correia , João C. M. Paiva , Victor M. S. GilJournal of Chemical Education2002 79 (5), 583A numerical problem was devised to improve the understanding of chemical equilibrium. It draws critical attention to the reference states when Kc and Kp are being used.
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History
- Received: August 03, 2009
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