Unformatted text preview: mass T, P Wb Q FIGURE 163 A control mass undergoing a chemical reaction at a specified temperature and pressure. A system and its surroundings form an adiabatic system, and for such systems 0. That is, a chemical reaction in an adiabatic Eq. 161 reduces to dSsys chamber proceeds in the direction of increasing entropy. When the entropy reaches a maximum, the reaction stops (Fig. 162). Therefore, entropy is a very useful property in the analysis of reacting adiabatic systems. When a reacting system involves heat transfer, the increase of entropy principle relation (Eq. 161) becomes impractical to use, however, since it requires a knowledge of heat transfer between the system and its surroundings. A more practical approach would be to develop a relation for the equilibrium criterion in terms of the properties of the reacting system only. Such a relation is developed below. Consider a reacting (or nonreacting) simple compressible system of fixed mass with only quasiequilibrium work modes at a specified temperature T and pressure P (Fig. 163). Combining the first and...
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 Summer '08
 HAJISHEIK
 Thermodynamics, Equilibrium, Combustion, Chemical reaction, equilibrium composition

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