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Thus, a given reaction at a fixed temperature has only one Kc value, but it can have a finite number of equilibrium positions. 13.3 Equilibrium Expressions Involving Partial Pressures. For reactions involving gaseous species, the equilibrium constant may be expressed in terms of partial pressures and denoted as Kp. For example, 2SO2(g) + O2(g) ⇄ ................
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