1. Unit 2, Lesson 9: Equilibrium Calculations – Part I
These calculations are extremely difficult. During this section of the unit, it will especially important to pay close attention to the examples given, and to do the assigned practice problems.

2. The Equilibrium Constant
The equilibrium constant, Keq, is an experimentally determined value and cannot be derived from theory.
Using experimental data and the equilibrium expression, various types of calculations can be made...
5 min

3. Example A
A 2.0 L bulb contains 6.00 mol of NO2(g), 3.0 mol of NO(g) and 0.20 mol of O2(g) at equilibrium. What is Keq for
2 NO(g) + O2(g) NO2(g)?
*Note: you can ignore the units of Keq since they are somewhat complicated and have little significance for you at this point in time.
Write expression, find concentrations, then sub in values. – 5 min

4. Brain Break!
Brain break! – 5 min

5. Example B
4.00 mol of NO2(g) is introduced into a 2.00 L bulb. After a while, equilibrium is attained according to the equation
2 NO(g) + O2(g) NO2(g).
At equilibrium, mol of NO(g) is found. What is the Keq value?
*Note: We cannot treat this question in the same way as the previous one, because now there is a factor of time to be considered.
ICE table, fill in known values, find changes based on stoichiometry. – 10 min

6. Practice Time!
Pg. 70 #47-49
25 min