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Unformatted text preview: Chapter 16 CHEMICAL AND PHASE EQUILIBRIUM n Chapter 15 we analyzed combustion processes under the assumption that combustion is complete when there is sufficient time and oxygen. Often this is not the case, however. A chemical reaction may reach a state of equilibrium before reaching completion even when there is sufficient time and oxygen. A system is said to be in equilibrium if no changes occur within the system when it is isolated from its surroundings. An isolated system is in mechanical equilibrium if no changes occur in pressure, in thermal equilibrium if no changes occur in temperature, in phase equilibrium if no transformations occur from one phase to another, and in chemical equilibrium if no changes occur in the chemical composition of the system. The conditions of mechanical and thermal equilibrium are straightforward, but the conditions of chemical and phase equilibrium can be rather involved. The equilibrium criterion for reacting systems is based on the second law of thermodynamics; more specifically, the increase of entropy principle....
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This note was uploaded on 06/15/2009 for the course MAE 3311 taught by Professor Hajisheik during the Summer '08 term at UT Arlington.

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