exam2 - General Chemistry 21-160-116 Exam 2 March 29th 2004...

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General Chemistry 21-160-116 Exam 2 March 29th 2004 Answer all questions on these sheets, show ALL work for non-multiple choice problems to receive full credit. Total 100 points. 1. Phosgene, COCl 2 , a poisonous gas, decomposes according to the equation: COCl 2 (g) CO(g) + Cl 2 (g) If K c = 0.083 at 900 ° C, what is K p for this reaction? (5 points) K c = K p (RT) - n a) 0.125 b) 8.0 c) 6.1 d) 0.16 e) 0.083 f) 8.51 x 10 -6 g) 621 h) 8.61 x 10 -4 2. 4.21 moles of S 2 Cl 4 are introduced into a 2.0 L vessel. The reaction: S 2 Cl 4 (g) 2SCl 2 (g) comes to equilibrium, and 1.25 moles of S 2 Cl 4 are found to remain in the container. Calculate K c for the reaction. (5 points) Page 1
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3. For the following reaction at equilibrium, which choice(s) give(s) a change that will shift the position of equilibrium to favor more products? (6 points, any wrong answers cancel right answers) 2NOBr(g) 2NO(g) + Br 2 (g) H ° rxn = 30 kJ a) increase the total pressure by decreasing the volume b) add more NO c) remove Br 2 d) lower the temperature e) selectively remove NOBr f) decrease the total pressure by increasing the volume g) add Br 2 h) raise the temperature 4. For the dimerization of NO 2 , 2NO 2 N 2 O 4 . K c = 215 at 22° C. Suppose that 0.0456 mol/L of the brown gas NO 2 were detected spectroscopically in a closed container. What
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exam2 - General Chemistry 21-160-116 Exam 2 March 29th 2004...

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