Teaching Expansion of Molar Heat Capacities of Gases
HU Fen1, WEI Sheng-Xian2, LI Dong-Yu3, SHI You-Ming3
1. College of Chemistry and Environmental Science, Qujing Normal University, Qujing 655011, China;
2. Center for Magnetic Materials and Devices, Qujing Normal University, Qujing 655011, China;
3. College of Physics and Electronics Engineering, Qujing Normal University, Qujing 655011, China
Abstract Molar heat capacity of a substance is one of the important parameters for calculation in quantity of heat, entropy and enthalpy changes. To enable college students to master comprehensively the concept of the molar heat capacity and its calculation method, taking the gas as an example, the molar heat capacities of the ideal gas, Van der Waals gas, Onnes gas and Redlich-Kwong gas were systematically summarized and analyzed based on literature researches. In addition, the molar heat capacity of Soave-Redlich-Kwong gas was deduced by using the first law of thermodynamics and the related thermodynamics formula. The internal relation between the molar heat capacity and the equation of state, and the difference between the molar heat capacity at constant pressure (CP) and the molar heat capacity at constant volume (CV) are discussed and analyzed. These findings and results obtained from this study have a certain reference value for the teaching expansion of molar heat capacity of the gas and college students' innovative self-study.
HU Fen, WEI Sheng-Xian, LI Dong-Yu, SHI You-Ming. Teaching Expansion of Molar Heat Capacities of Gases[J]. Chinese Journal of Chemical Education, 2019, 40(18): 17-22.
