Lec-03-Chap06-3

Lec-03-Chap06-3 - Lec-03-Chap06-3.ppt 9/4/2009 Lec-03:...

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Lec-03-Chap06-3.ppt 9/4/2009 Thermochemistry Standard Enthalpies of Reactions 1 Email questions should be submitted to che132@notes.cc.sunysb.edu . Emails sent to instructors’ personal accounts may be lost . 1 Prof. Troy Wolfskill : Tue. 11:00 - 12:00 AM Wed. 12:00 – 1.00 PM Office hours are in the Chemistry Dept. Main Office, 1 st floor of the Graduate Chemistry Building. Teaching Assistants Office hours: Soumya Bhattacharya: Tue. 10:30 AM – 12:30 PM Stanislav Salnikov: Thu. 3:00 PM – 5:00 PM Daniel Amarante: Tue. 5:30 – 7:30 PM Office hours are in the Chemistry Learning Center, Room 312, 3 rd floor of the Graduate Chemistry Building. Lec-03: Chemical Thermodynamics Chapter 6 - Continued Exam 1: 120 pts Tue. Sept. 22 (90 min) Exam 2: 120 pts Wed. Oct. 21 (90 min) Exam 3: 120 pts Thu. Nov. 19 (90 min) Final: 140 pts Tue. Dec. 15 (150 min) 2 Announcement placed in Blackboard and emailed help you resolve difficulties registering for LUCID. If problems, you must see Dr. Wolfskill (Room 575). Clickers: You must use the instructions in Blackboard for registering your response pad. There is no class key for the course this semester. If you have tried to register your clicker and failed, contact e-instruction's tech support team at 888.333.7532.
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Lec-03-Chap06-3.ppt 9/4/2009 Thermochemistry Standard Enthalpies of Reactions 2 Transfer of energy between subsystems m A , T A m B , T B m A , m B , T f Assuming that at contact A and B only exchange energy with each other     pp AB qq  Expressing each q p in terms of the masses, the specific heat capacities, and the changes in temperatures:     A A f f B B TT mm cc 3 Lec-03: Chemical Thermodynamics Chapter 6 - Continued Enthalpy Changes: Transfer of energy between subsystems m A , T A m B , T B m A , m B , T f f B A A B T T T m m m m 4
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Lec-03-Chap06-3.ppt 9/4/2009 Thermochemistry Standard Enthalpies of Reactions 3 Transfer of energy between subsystems 250 g of Al at 97 °C are put in contact with 780 g of Au at 17 °C. What is the final equilibrium temperature? Data: c s (Al)=0.902 J g -1 °C -1 ; c s (Au)=0.128 J g -1 °C -1             97 C 17 C JJ 0.902 0.128 g C g C 0.902 0.128 g 250g 780g 250 CC 0 g g 78 g f T      72.4 C f T  AB f B A A B cc T T T m m m m 5
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Lec-03-Chap06-3 - Lec-03-Chap06-3.ppt 9/4/2009 Lec-03:...

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