1. As always… OWL Lon-Capa assignments Lecture videos Textbook
HW due today
Quiz #4 opens today
Lecture videos
Textbook
Read
Do text homework

2. Exam II Thursday, November 1, 7:00-9:00 pm; rooms are on the website.
Conflict: (11/1) 4:30-6:30pm in 219 Greg; sign up in 1026 CA
Conflict with conflict? me right away.
Review sessions:
Monday (10/29): 217 Noyes Lab (6-8 pm)
Tuesday (10/30): 163 Noyes Lab (6-8:30 pm)

3. Exam II Practice exam is posted.
Take when you feel ready for the exam.
Take as an actual exam (not just more practice problems).
See the front of the exam for information that you are given and the number of problems.

4. Clicker Question (slide 1/2)
You transfer equal amounts of heat (1.00 kJ) to two separate samples of 1.00 mol of an ideal monatomic gas each at 25°C. One sample is in a steel tank, and the other is in a container fitted with a frictionless, massless piston. Compare ∆S for each.
∆S for the gas in the steel tank =
a) 1.10 J/K
b) 1.83 J/K
c) 2.97 J/K
d) 3.11 J/K
e) 4.95 J/K

5. Clicker Question (slide 2/2)
You transfer equal amounts of heat (1.00 kJ) to two separate samples of 1.00 mol of an ideal monatomic gas each at 25°C. One sample is in a steel tank, and the other is in a container fitted with a frictionless, massless piston. Compare ∆S for each.
∆S for the gas in container fitted with the piston =  
a) 1.10 J/K
b) 1.83 J/K
c) 2.97 J/K
d) 3.11 J/K
e) 4.95 J/K

6. Clicker Question (1/3) Consider the reaction 2NO2(g) N2O4(g).
When NO2(g) is introduced to a flask at atm and allowed to come to equilibrium, the equilibrium pressure of N2O4(g) is atm.
Determine the value of the equilibrium constant at 25.0°C.
a) b) c) 2.13 d) 8.35 e) 11.2

7. Clicker Question (2/3) Consider the reaction 2NO2(g) N2O4(g).
For this reaction, ∆H° = –58 kJ per mol of N2O4(g) produced at 25.0°C. Assume ∆H° is independent of temperature.
Determine the value of the equilibrium constant at 100.0°C.
a) b) 8.35 c) 217 d) e) 1240

8. Clicker Question (3/3) Consider the reaction 2NO2(g) N2O4(g).
The value of S°[N2O4(g)] = 304 J/Kmol at 25.0°C. Determine the value of S°[NO2(g)] in J/Kmol at 25.0°C.
a) b) 130 c) 198 d) e) 478