Analysis of Chemical Reactions by Means of Isoconversion Curves: Kx = Constant

Valeriu Voiculescu , Luminita Simoiu and Gavril Niac
University of Craiova, Faculty of Science, A. I. Cuza 13, Craiova 1100, ROMANIA
J. Chem. Educ., 1998, 75 (2), p 203
DOI: 10.1021/ed075p203
Publication Date (Web): February 1, 1998
History, Education, and Documentation

Abstract

For the equilibrium reaction having a gaseous phase, there is established the equation of the isoconversion curve Kx = constant, with variables of pressure and temperature: ln P (atm) = -ln Kx/Delta n -Delta G°T/Delta nRT where Delta G°T is the function of Gibbs for the chemical reaction at the temperature T and pressure p = 1 atm: Delta G°T = Delta H°T -TDelta G°T For the special case of Kx = 1 (or APT = 0) there is obtained "the curve of normal null affinity". This curve divides the plane ln P- T into two regions. On one side of the curve AP,T > 0, Kx > 1, and the reaction is thermodynamically possible; on the other side, APT < 0, 0<Kx<1 and the conversion of the reactants is poor, or the reaction does not take place. Also discussed are the particularities of these curves for 12 kinds of thermodynamic chemical reactions which are taken in a multivariant or monvariant system.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Chemical Education Research

Keywords (Subject):

Equilibrium
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  • Received: August 03, 2009

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