Chapter 4 - Thermodynamic functions of hydrocarbons in the ideal gas state

Abstract

This chapter describes methods for determining thermodynamic properties in an ideal gas state. It provides insight into the sum of states of polyatomic molecules and defines how to calculate various heat capacity components of a substance in an ideal gas state. Theoretical, semi-empirical, and empirical ratios for calculating the thermodynamic functions in an ideal gas state are considered. The coefficients for various forms of interpolation equations describing thermodynamic functions in an ideal gas state are presented. Predictive methods for calculating the thermodynamic properties of hydrocarbons in an ideal gas state and the possibility of extrapolation to the low-temperature region are considered. The issue of a reasonable choice of the starting point for the thermodynamic potentials is discussed.