1. WARM UP
How many grams of helium are required to fill a 725 L hot air balloon to a pressure of 1425 mmHg at 55° C?

2. Gas Laws

3. Boyle’s Law Robert Boyle As pressure increases, volume decreases
P ≈ 1/V
P1V1 = P2V2

4. Boyle’s Law

5. Charles’s Law (Gay-Lussac’s Law)
Jacques Charles
(Joseph Gay-Lussac)
As temperatures increase, volume increases
V ≈ T
V1 = V2
T T2

6. Charles’s Law (Gay-Lussac’s Law)

7. Avogadro’s Law Amadeo Avogadro
As moles (n) of a gas increases, volume increases
V ≈ n
V1 = V2
n n

8. Combined Gas Law Combine Boyle’s, Charles’s, and Avogadro’s Laws
Moles, pressure, volume, and temperature are all proportional to each other
P1V1 = P2V2
n1T1 n2T2

9. WRAP UP
Name and describe the 5 gas laws, using 5 words or less for each description.

10. WARM UP
A sample of gas has a volume of 200 cm3 at a pressure of .925 atm. If the pressure is dropped to .091 atm, what volume would the gas occupy?

11. WRAP UP
1. If 2.00 L of oxygen at 25° C are allowed to warm to 95° C at constant pressure, what is the new volume of oxygen gas?