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Practice Exam I #1

# Practice Exam I #1 - CH 223 Practice Exam I#1 Spring 2012 1...

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CH 223 Practice Exam I #1 Spring 2012 1 1. Find the concentration of B in an equilibrium gas mixture that has [C] = 4.61 × 10 -2 M: B(g) 2C(g) , K c = 5.38 × 10 -3 A) 8.5 × 10 -2 M B) 9.2 × 10 -1 M C) 3.1 × 10 -3 M D) 4.0 × 10 -1 M E) 1.9 × 10 -2 M 2. Consider the following hypothetical reactions: 1. A + 2B AB 2 K 1 = 1.0 x 10 3 2. A + B AB K 2 = 1.0 x 10 -5 3. AB 2 AB + B The value of K c for reaction 3 is A) 1 x 10 -8 B) 1 x 10 -2 C) 1 x 10 2 D) 1 x 10 8 3. If K = 0.145 for A 2 + 2B 2AB, then for AB B + 1/2A 2 , K would equal

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2 4. At 200 ° C, nitrogen oxide reacts with oxygen to form nitrogen dioxide as follows: 2 NO (g) + O 2 (g) 2 NO 2 (g) K c = 3.0 x 10 6 If a mixture of these three gases contains 0.10 M NO, 0.10 M NO 2 , and 0.01 M O 2 , then we can accurately predict that the reaction: direction the reaction must go to reach equilibrium.
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