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Thermodynamics filled in class notes_Part_85

Thermodynamics filled in class notes_Part_85 - 5.5 CHEMICAL...

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5.5. CHEMICAL KINETICS OF A SINGLE ISOTHERMAL REACTION 177 5.5 Chemical kinetics of a single isothermal reaction In the same fashion in ordinary mechanics that an understanding of statics enables an under- standing of dynamics, an understanding of chemical equilibrium is necessary to understand to more challenging topic of chemical kinetics. Chemical kinetics describes the time-evolution of systems which may have an initial state far from equilibrium; it typically describes the path of such systems to an equilibrium state. Here gas phase kinetics of ideal gas mixtures that obey Dalton’s law will be studied. Important topics such as catalysis and solid or liquid reactions will not be considered. Further, this section will be restricted to strictly isothermal systems. This simplifies the analysis greatly. It is straightforward to extend the analysis of this system to non-isothermal systems. One must then make further appeal to the energy equation to get an equation for temperature evolution. The general form for evolution of species is taken to be d dt parenleftbigg ρ i ρ parenrightbigg = ˙ ω i ρ . (5.275) Multiplying both sides of Eq. (5.275) by molecular mass
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