高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (4): 357.

• 研究简报 • 上一篇    下一篇

平衡常数的无热容近似式

周振华   

  1. 天津纺织工学院纺化系
  • 收稿日期:1983-11-02 出版日期:1985-04-24 发布日期:1985-04-24

An Approximate Formula Without Heat Capacity for Equilibrium Constant

Zhou Zhenhua   

  1. Department of Textile Chemistry, Tianjiu Textile Engineering Institute, Tianjin
  • Received:1983-11-02 Online:1985-04-24 Published:1985-04-24

摘要: 本文基于自由能函数随温度变化极为缓慢的特性,按热力学基本关系式简捷地导得了一个不需热容数据的平衡常数近似式(简称无热容近似式),应用该式仅需一个温度下的K_p值和可自手册查得的标准生成热及标准熵的数据即可在较宽的温度范围内求得另一温度下的K_p值,且具有较高的准确度。

Abstract: According to the Free-Energy Functions the following approximate formula without heat capacity for equilibrium constant is suggested:lgKp= - (△H2980/4.576T)+ (△S2980/4.576)+a(T-298) where a = constant, obtained by use of only a single measurement of Kp.More than110 equilibrium constants of reactions have been calculated at different temperatures and the results obtained coincide very well with the experimental values.

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