1. Lon-Capa 4 th HW assignment due Friday, 10/9, 5 pm. It is open now. 3 rd Quiz due Sunday, 10/11 by 10 pm. It will open Friday, 10/9 at 5 pm. 5 th HW assignment is also open! 1

2. 2 Clicker Question Given the following data 2NH 3 (g)  N 2 (g) + 3H 2 (g)  H = 92kJ 2H 2 (g) + O 2 (g)  2H 2 O(g)  H = -484kJ Determine ΔH for 2N 2 (g) + 6H 2 O(g)  3O 2 (g) + 4NH 3 (g) a) -1268 kJ b) 1268 kJ c) 1636 kJ d) -1636 kJ e) I did not/cannot get any of these answers.

3. 3 Pathway for the Combustion of Methane

4. 4 Schematic Diagram of Energy Changes

5. 5 Chapter 9: Problem #99 When water is supercooled, it freezes at a temperature below 0.0°C. If 10.9 kJ of energy as heat is released when 2.00 mol of supercooled water at –15.0°C freezes, calculate the molar enthalpy of fusion for ice at 0.0°C and 1 atm. Assume the molar heat capacities are temperature independent. [for H 2 O(l): 75.3J/Kmol, for H 2 O(s): 37.5J/Kmol]