Lec-10-Chap14-2-Complete

Lec-10-Chap14-2-Complete - Lec-10=Chap14-2-Complete...

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Lec-10=Chap14-2-Complete 9/25/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 1 Lec-10: Chemical Equilibrium Chapter 14 1 Consider the following mechanism NH 2 NO 2 (aq) + OH (aq) → NHNO 2 (aq) + H 2 O(l) NHNO 2 (aq) → N 2 O(g) + OH (aq) Which of the following statements is (are) incorrect? (1) The overall chemical reaction is NH 2 NO 2 (aq) → N 2 O(aq) + H 2 O(l) (2) OH (aq) is a reaction intermediate (3) NHNO 2 (aq) is a catalyst (4) OH (aq) is a catalyst (5) The rate of consumption of NH 2 NO 2 (aq) equals the rate of production of N 2 O(aq). Equilibrium Constants: General Case         D AB C cd ab c K the equilibrium constant expression is Notice that the concentrations correspond to the equilibrium state , for example [A] e . For simplicity we omit the subscript “e” in the following. C+ D+ A+ B+ For a reaction 2
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Lec-10=Chap14-2-Complete 9/25/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 2 What is the equilibrium constant expression for the reaction         2 Fe s CO g FeO s CO g                          2 2 2 2 FeO CO A: Fe CO CO B: CO CO C: CO FeO D: Fe Fe CO E: FeO CO c c c c c K K K K K Answer: C 3 Chemical Equilibrium – Gas phase reactions Ideal gases satisfy the equation of state p V T n R If we have a mixture     AB A B Vn p p p p n n p T n R n A A p V T n R which gives the following expression for the partial pressure of a substance in the mixture: And similar equations for the other substances B, C, … 4
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Lec-10=Chap14-2-Complete 9/25/2009 Chemical Equilibrium Concepts. Equilibrium constant. Uses 3 Chemical Equilibrium – Gas phase reactions We can then write for the partial pressure of each substance   A A A R n V p T RT      D A C B ab d cd c c RT pp R K T   we can express the right-hand side of the equilibrium constant equation as C+ D+ A+ B+ Then for the chemical equilibrium         D AB C c K 5 And similar equations for the other substances B, C, …   A A T p R Chemical Equilibrium – Gas phase reactions is a constant independent of the concentrations of reactants and products.
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Lec-10-Chap14-2-Complete - Lec-10=Chap14-2-Complete...

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