1. As always… OWL Lon-Capa assignments Lecture videos Textbook Read
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2. Schematic Diagram of Energy Changes

3. Fe2O3(s) + 2Al(s)  Al2O3(s) + 2Fe(l)
Clicker Question
Given that ΔH°fusion for Fe(s) = 13.6 kJ/mol and the following data:
Fe2O3(s) Al2O3(s)
ΔHf°(kJ/mol) –826.0 –1676.0
Determine ΔH°rxn (kJ) for the thermite reaction (at constant temperature) as represented by the equation:
Fe2O3(s) + 2Al(s)  Al2O3(s) + 2Fe(l)
a) – b) – c) – d) – e) –877.2

4. Chapter 9: Problem #117
This problem is an application of Hess’s law, although it may not be obvious upon reading it.

5. Clicker Question
What is the smallest number of ice cubes at 0°C, each containing one mole of water, necessary to cool g of liquid water initially at 20°C to 0°C at 1.00 atm? Assume for this problem that H and Cp are temperature independent.
ΔHf° = kJ/mol of H2O(l)
ΔHf° = kJ/mol of H2O(s)
Cp = 75.3 J/molK for H2O(l)
a) b) c) d) e) 126