1. Collisions with gas particles are elastic.
Ideal Gases
Assumptions:
Gases consist of tiny particles that are far apart.
Collisions with gas particles are elastic.
Gas particles are in constant, rapid motion.
There are no forces of attraction between gas particles

2. Real Gases Do Not Behave Ideally
Real gases DO experience inter-molecular attractions
Real gases DO have volume
Real gases DO NOT have elastic collisions

3. Real Gases are not “ideal”….
At high pressure
At very low temperature
For very large or polar molecules

4. Ideal Gas Law relates the amount of gas (n, number of moles), volume (V), temperature (T), and pressure (P).
T = Temperature in Kelvin

5. Ideal Gas Law v. Combined Gas Law
If there are “moles” (or “mass”) in your gas law problem, then use the IDEAL GAS LAW.
If there are no “moles” (or “mass”), then use the COMBINED GAS LAW.

6. Ideal Gas Law Problem #1
What pressure in atmospheres (atm) will 18.6 mol of methane exert when it is compressed in a L tank at a temperature of 45°C? PV = nRT

7. Ideal Gas Law Problem #1 PV = nRT

8. Ideal Gas Law Problem #2
Calculate the number of moles of gas contained in a 3.0 L vessel at 300 K and a pressure of 152 kPa. PV = nRT

9. Ideal Gas Law Problem #2 PV = nRT

10. Ideal Gas Law Problem
PV = nRT