1. To Do… Electronic homework Exam 2: Thursday, March 15 OWL:
Chapter 9 (Part 1): Friday, March 2
Chapter 9 (Part 2): Wednesday, March 7
Chapter 13 (Gas Stoichiometry): Friday, March 9
Chapter 15 (Solution Stoichiometry): Tuesday, March 13
Lon-Capa: Exam 2 review: due Wednesday, March 14 by 10 pm
Exam 2: Thursday, March 15

2. To Do… Lab Section tomorrow Lectures Discussion Section
Pre-lab assignment due before lab (page 42)
Lectures
Continue reading Chapter 9 and doing the text homework. Also, Sections and 15.6 & 15.7
Discussion Section
Turn in Chapter 9 homework.
Turn in lab write-up.

3. Stoichiometry
Determine the amount(s) of reactant(s) or product(s) given amount(s) of reactant(s) or product(s).
We must have a balanced chemical equation.
Reactions occur by numbers of atoms/molecules.

4. Determine Number of Moles
Use mass and molar masses.
Use volume and concentration for solutions.
Use pressure, volume, and temperature for gases.

5. Previous Lecture Questions
1. If you have 8 moles of hydrogen and all the oxygen you need, how many moles of water can you make?
2. If you have 6 moles of oxygen and all the hydrogen you need, how many moles of water can you make?
3. If you have 8 moles of hydrogen and 6 moles of oxygen, how many moles of water can you make?

6. Clicker Question 12 mol H2 reacts with 5 mol O2
Limiting Mol Product Leftover Reactant
A) H mol 1 mol O2
B) H mol 7 mol O2
C) O mol 7 mol H2
D) O mol 2 mol H2
E) Neither mol None

7. Clicker Question 16.128 g H2 reacts with 96.00 g O2
Limiting Mol Product Leftover Reactant
A) H mol 1 mol O2
B) H mol 1 mol O2
C) O mol 2 mol H2
D) O mol 2 mol H2
E) Neither mol None

8. Solids, Solutions, and Gases
NaHCO3(s) + HC2H3O2(aq) → NaC2H3O2 (aq) + H2O(l) + CO2(g)
Which balloon will be the biggest?
Trial #
Mass of NaHCO3
Volume of M HC2H3O2 1
3.30 g
150.0 mL 2
5.70 g 3
10.5 g 4
21.0 g 5
31.8 g