1. To Do… Electronic homework OWL:
Chapter 13 (Gas Stoichiometry): Friday, March 9
Chapter 15 (Solution Stoichiometry): Tuesday, March 13
Lon-Capa: Exam 2 review: Wednesday, March 14 by 10 pm

2. Exam 2
Thursday, March 15, 7:00 pm – 8:30 pm; Rooms on the website (same as Exam 1).
Conflict: 3/15; 5:00 pm – 6:30 pm in 1022 Lincoln Hall; sign up in 1026 CA.
Practice exam will be posted online tomorrow.
See me right away if you have a conflict with the exam and conflict times.

3. Review Session
Monday, March 12
161 Noyes Lab
7:00-9:00 pm

4. Stoichiometry Problem
Consider mL of 0.30M Pb(NO3)2 (aq) mixed with mL of 0.40M KI (aq).
Determine the mass of solid formed from a complete reaction.
Determine the concentrations of all ions after the reaction is complete.

5. Previous Exam Problem
Consider the following container, displaying molecules of generic diatomic gases A2 and B2 before any chemical reaction has occurred.
After reacting, both substances are completely consumed by the chemical reaction and neither reactant is in excess. Which chemical reaction took place? Note that all reactions shown below are currently unbalanced.
a. A2 + B2 A2B3 d. A2 + B2  A2B5
b. A2 + B2  AB3 e. A2 + B2  A2B4
c. A2 + B2  AB

6. Clicker Question
Equal masses (in grams) of hydrogen gas and oxygen gas are reacted to form water. Which reactant is limiting?
2H2 + O2  2H2O
a) Hydrogen
b) Oxygen
c) Neither

7. Previous Exam Problem
When 0.50 moles of N2 react with sufficient element X, about 131 grams of compound X3N are formed.
Identify element X.

8. C2H2(g) + O2(g)  CO2(g) + H2O(g)
Previous Exam Problem
A reaction occurs in a rigid, closed container between acetylene gas and oxygen gas to form carbon dioxide and water vapor according to the unbalanced equation shown below:
C2H2(g) + O2(g)  CO2(g) + H2O(g)
52.08 g acetylene reacts with g oxygen gas in a container with volume of L which maintained a constant temperature of 30.0°C after the reaction.
What was the total pressure inside the container after the reaction took place?