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In the limiting case of a complete reaction no

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Unformatted text preview: ceed to any appreciable degree. Thus reactions with very small KP values at a specified temperature can be neglected. A reaction with KP 1000 (or ln KP 7) is usually assumed to proceed 7) is assumed to completion, and a reaction with KP 0.001 (or ln KP 6.8 for the reaction N2 2N not to occur at all. For example, ln KP at 5000 K. Therefore, the dissociation of N2 into monatomic nitrogen (N) can be disregarded at temperatures below 5000 K. 4. The mixture pressure affects the equilibrium composition (although it does not affect the equilibrium constant KP). This can be seen from nP nR (the difEq. 1615, which involves the term Pn, where n ference between the number of moles of products and the number of moles of reactants in the stoichiometric reaction). At a specified temperature, the KP value of the reaction, and thus the right-hand side of Eq. 1615, remains constant. Therefore, the mole numbers of the reactants and the products must change to counteract any changes in the pressure term. The direction of the change depends on the sign...
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