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Unformatted text preview: 1>2 w b (4) 806 | Thermodynamics
Solving Eqs. (1), (2), (3), and (4) simultaneously for the four unknowns x, y, z, and w yields x z 0.271 1.849 y w 0.213 1.032 Therefore, the equilibrium composition of 1 kmol H2O and 2 kmol O2 at 1 atm and 4000 K is 0.271H2O 0.213H2 1.849O2 1.032OH Discussion We could also solve this problem by using the KP relation for the stoichiometric reaction O2 2O as one of the two equations. Solving a system of simultaneous nonlinear equations is extremely tedious and time-consuming if it is done by hand. Thus it is often necessary to solve these kinds of problems by using an equation solver such as EES. 165 VARIATION OF KP WITH TEMPERATURE It was shown in Section 162 that the equilibrium constant KP of an ideal gas depends on temperature only, and it is related to the standard-state Gibbs function change G*(T) through the relation (Eq. 1614)
ln KP G* 1T2 RuT In this section we develop a relation for the variation of KP with temperature in terms of other properties. Substituting G*(T) H*(T) T S*(T) in...
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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.
- Summer '08