1. Announcements Be respectful – no electronics please!
Exam #2: Thursday, March 14th, 7:00-8:30pm
Additional Question and answer times posted on course website
Old exams are posted on course website
Sign up for conflict exam (5-6:30 pm) in 1026 Chem Annex until noon on March 14th
Pre/Post Lecture due Tuesday
Stoichiometry Workshop on Tuesday
Must be present in lecture to get credit!
Online HW 5 due next Wednesday by 10:00pm
Review Questions due next Wednesday by 10:00pm

2. Example #1
Given 3.00 g of NaHCO3, how much 3.00 M H2SO4 do we need (in mL)?
2NaHCO3(g) + H2SO4(aq)  2H2O(g) + 2CO2(g) + Na2SO4(aq)

3. Clicker #1
Which results in the largest balloon full of carbon dioxide?
Combination 1
Combination 2
Same Size
NaHCO3
H2SO4
Combination 1
10 mol
5 mol
Combination 2

4. Example #2 2NaN3(s)  3N2(g) + 2Na(s)
What would be the volume of nitrogen gas produced in an airbag containing 6.63 g of NaN3 at 1.05 atm and 22°C?
2NaN3(s)  3N2(g) + 2Na(s)

5. Clicker #2 6 mol H2 reacts with 4 mol O2
Limiting Mol Product Leftover Reactant
A) H mol 2 mol O2
B) H mol 1 mol O2
C) O mol 2 mol H2
D) O mol 4 mol H2
E) Neither mol None

6. Clicker #3 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 #4 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. Example #3
5 moles of hydrogen gas and 1 mole of oxygen gas initially react in a rigid container at constant temperature. If the initial pressure in the container is 2.0 atm, what is the pressure in the container after the reaction?

9. Example #4
4 moles of hydrogen gas and 4 moles of oxygen gas initially react in a flexible balloon at constant temperature. The balloon does not pop as a result of the reaction. If the initial volume of the balloon is 10.0 L, what is the volume of the balloon after the reaction?

10. Example #5 Consider the reaction:
(NH4)2CO3(s)  2NH3(g) + CO2(g) + H2O(g)
What total volume of gas is produced, measured at 453oC and 1.04 atm, if 52.0 g of ammonium carbonate is heated?