燃烧反应C10H8(s) +12O2(g)→10CO2(g)+4H2O(l)的热力学焓和内能

用实验的方法测定了燃烧反应C10H8(s)+12O2(g)10CO2(g)+4H2O(l)的热力学焓ΔH和内能ΔU.根据热力学基本定律用实验数据计算结果表明该燃烧反应焓ΔH=-5093.3kJ.mol-1和反应内能ΔU=-5012kJ*mol-1,与理论计算结果相近似.为了了解反应物和产物的微观结构在该反应热力学性能中所起作用,介绍和讨论了在反应过程中反应物和产物的熔化和内部结构变化对反应熵S,焓H和热容Cp(T)的影响.

Thermodynamic Enthalpy and Internal Energy in the Reaction System C10H8(s) +12O2(g)→10CO2(g)+4H2O(l)

Thermodynamic enthalpy, ΔH and internal energy, ΔU in the reaction system C10H8 + 12O2→10CO2+4H2O are determined using an experimental method in our laboratory. Under the experimental conditions, the results calculated show that the reaction combustion enthalpy ΔH is -5093.3?kJ*mol-1 and internal energy ΔU is -5012 kJ*mol-1 on the basis of basic thermodynamic laws. The results are in good agreement with those calculated by theoretical methods. To understand the role of microstructure changes of the reactants and products in determining thermodynamic properties in the reaction system, contributions to entropy, ΔS, enthalpy, ΔH, and heat capacity, Cp(T), from melting and internal configuration change of reactants or products in the reaction are introduced and discussed.