1. Gases
Ideal Gas law

2. Combinations of Gas Laws
Combined Gas Law:
Ideal Gas Law
Universal Gas Constant (R)
combined proportionality constant
equals L*atm/mol*K
equals J/mol*K

3. Real Gases vs. Ideal Gases
an ideal gas is a hypothetical substance that obeys the ideal gas law
real gases approach this behavior closest at low pressure and high temperature
more on this in section 5.6

4. Gases
Gas Stoichiometry

5. Molar Volume 22.42 L / mol at STP
Standard Temperature and Pressure (STP): 0°C and 1 atm

6. Molar Mass and Density

7. Example 1
CaO is made from decomposition of CaCO3. Find the volume of CO2 at STP made from decomposition of 152 g CaCO3.

8. Example 2
A sample of CH4 gas having a volume of 2.80 L at 25°C and 1.65 atm was mixed with sample of O2 gas having volume of 35.0 L at 31°C and 1.25 atm. The mixture formed CO2 and H2O. Find the volume of CO2 at 2.50 atm and 125°C.

9. Example 2
Find the limiting reactant:
CH4 is ER
O2 is LR

10. Example 2 Find the amount of product produced:
Find the volume of product produced:

11. Example 3
If the density of a sample of gas is 1.95 g/L at 1.50 atm and 27°C, find the molar mass of gas. What could the identity of the gas be?
Oxygen!!