1. The Combined Gas Law and Avogadro’s Principle
Section 14.2
The Combined Gas Law and Avogadro’s Principle

2. Objectives
State the relationship among temperature, volume, and pressure as the combined gas law.
Apply the combined gas law to problems involving the pressure, temperature, and volume of a gas
Relate numbers of particles and volume by using Avogadro’s principle.

3. Key Terms
Combined gas law
Avogadro’s principle
Molar volume

4. The Combined Gas Law
Boyle’s, Charles’s, and Gay-Lussac’s
States relationship among P, V, and T of a fixed amount of gas
P is inversely proportional to V
P is directly proportional to T
V is directly proportional to T

5. Mathematical Equation
P1V1 = P2V2
T T2

6. Practice Problems
Page 430
19-21

7. Avogadro’s Principle
Equal volumes of gases at the same T and P contain equal number of particles
Avogadro, 1811
Remember the mole (6.02 x 1023)

8. Molar Volume
Volume that one mole occupies at STP
0 C and 1.00 atm
Conversion factor:
22.4 L
1 mol

9. Practice Problems
Page 432
24, 27
Page 433
29-30