How Thermodynamic Data and Equilibrium Constants Changed When the Standard-State Pressure Became 1 Bar

Richard S. Treptow
Department of Chemistry and Physics, Chicago State University, Chicago, IL 60628
J. Chem. Educ., 1999, 76 (2), p 212
DOI: 10.1021/ed076p212
Publication Date (Web): February 1, 1999

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 Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Thermodynamics

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History

  • Received: August 03, 2009

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