Lon-Capa Lon-Capa: 5th HW assignment due tonight by 5 pm. Lon-Capa: 4th Quiz due Sunday, 1023 by 10 pm. Tonight at 5 pm.

Exam II Tuesday, October 25, 7:00-9:00 pm; rooms are on the website (same as before). Conflict: (10/25) 4:30-6:30 pm in 165 NL; sign up in 367 NL Conflict with conflict? Email me right away. Practice Exam is Posted Review session: Saturday, 10/22 from 4:00-5:00 pm in 161 NL Sunday, 1023 from 7:00-8:00 pm in 161 NL

Clicker Question Given the following data, determine the equilibrium constant for the “pop bottle” reaction at 25C. 2H2(g) + O2(g)  2H2O(l) Gf (kJ/mol) 0 0 -237 a) 3.50 x 1041 b) 1.22 x 1083 c) 8.17 x 10-84 d) 2.86 x 10-42 e) I do not know how to do this problem.

Exothermic vs. Endothermic

Clicker Question 2SO2(g) + O2(g)  2SO3(g). Knowing that G= -142 kJ/mol for the above reaction, predict the direction the system will shift to reach equilibrium if the system has the initial conditions: P(SO2) = 0.10 atm, P(O2) = 0.20 atm, and P(SO3) = 5.0 atm. a) Shifts to the left. b) Shifts to the right. c) The reaction is at equilibrium with those initial conditions.

Clicker Question Given the following data, determine the boiling point of methanol (CH3OH). Hf (kJ/mol) S (J/Kmol) CH3OH(g) -201 240 CH3OH(l) -239 127 a) 63 K b) 63C c) 336C d) 1198 K e) None of these

Clicker Question Consider the spontaneous reaction: N2(g) + 3H2(g)  2NH3(g) Is the reaction endothermic or exothermic? a) Endothermic b) Exothermic c) More information is needed. d) I do not know.

Clicker Question A stable diatomic molecule spontaneously forms from its atoms at constant pressure and temperature. How does temperature affect the reaction? a) An increase in temperature makes the reaction more favorable. b) An increase in temperature makes the reaction less favorable. c) We cannot tell from the information we know. d) I do not know.