key2(1) - Name: _ Chemistry 1212K Test II Kw = 1.0 x 10-14...

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Name: _____________________ Chemistry 1212K Test II K w = 1.0 x 10 -14 Questions (5 points each, SHOW ALL WORK ON THE TEST) 1. What is the equilibrium constant expression for the following chemical reaction? I 2 (g) + Br 2 (g) 2 IBr(g) 2 2 2 2 2 2 ] ][ [ ] [ Br I IBr p c P P P K or Br I IBr K = = 2. At a certain temperature, a flask at equilibrium contains 0.0551 M HCl, 0.112 M Cl 2 , and 0.105 M H 2 . What is the value of K c for the equilibrium: 2 HCl(g) Cl 2 (g) + H 2 (g) 87 . 3 ] 0551 . 0 [ ] 105 . 0 ][ 112 . 0 [ ] [ ] ][ [ 2 2 2 2 = = = HCl H Cl K c 3. Consider the reaction below: CO(g) + H 2 O(g) CO 2 (g) + H 2 (g) CO(g) and H 2 O(g) are mixed together in such a way that their initial concentrations were 0.35 M and 0.40 M respectively. At equilibrium it was found that the concentrations of CO(g) was 0.19M. What is the K c for this reaction? If CO(g) decreses by 0.16M H 2 O should decrease by the same amount (1:1 ratio) and the concentrations of CO 2 and H 2 should increase by the same amount (1:1 ratio). So H 2 O(g) eq = 0.40 – 0.16 = 0.24 CO 2 (g) eq = H 2 (g) eq = 0.16 CO(g) H 2 O(g) CO 2 (g) H 2 (g) Init. 0.35 0.40 -- -- Equil. 019 0.24 0.16 0.16 Change 0.16 0.16 0.16 0.16
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This note was uploaded on 11/16/2011 for the course CHEM 1212k taught by Professor Wood during the Spring '08 term at Valdosta State University .

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key2(1) - Name: _ Chemistry 1212K Test II Kw = 1.0 x 10-14...

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