CHE102 - Lecture 9

CHE102 - Lecture 9 - 1. Problem set #3 on Mastering...

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1. Problem set #3 on Mastering Chemistry . Due Friday (2/8/08) at 7:00 am . 2. Reading for Friday: 3. Quiz 1: this week in recitation section (2/4 – 2/8) – Chs. 13, 14 4. Exam 1: Friday, Feb. 15 th 7:00 – 9:00 pm. Rooms to be announced. Coverage: Chs. 13, 14, 15.
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1. Chemical equilibrium = dynamic equilibrium Forward rate = reverse rate 1. Equilibrium constant Ch. 15 - Equilibrium a A + b B k f k r d D + e E b a e d r f c k k K ] B [ ] A [ ] E [ ] D [ = = Law of mass action
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Magnitude of K c 2SO 2 (g) + O 2 (g) 2SO 3 (g) 2 - 3 2 2 2 3 10 x 19 . 4 ] H ][ N [ ] NH [ = = c K N 2 (g) + 3H 2 (g) 2NH 3 (g) 31 - 2 2 2 10 x 8 . 4 ] O ][ N [ ] NO [ = = c K N 2 (g) + O 2 (g) 2NO (g) 4 2 2 2 2 3 10 x 0 . 3 ] O [ ] SO [ ] SO [ = = c K Reactants favored Reactants heavily favored Products favored Why no units?
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“Activity :” a = concentration / standard concentration (1 M) a = pressure / standard pressure (1 atm) 2SO 2 (g) + O 2 (g) 2SO 3 (g) 4 2 2 2 2 3 O 2 SO 2 SO 10 x 0 . 3 M 1 ] O [ M 1 ] SO [ M 1 ] SO [ 2 2 3 = = = a a a K c unitless
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K c vs. K p n 2 NOCl Cl 2 NO 2 3 2 NOCl Cl 2 NO 2 NOCl Cl 2 NO 1 1 1 RT RT RT 2 2 2 × = = × = × = = = = RT
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CHE102 - Lecture 9 - 1. Problem set #3 on Mastering...

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