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?

Gas Laws

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

Boyle’s Law

Charles’s Law (Gay-Lussac’s Law) Jacques Charles (Joseph Gay-Lussac) As temperatures increase, volume increases V ≈ T V1 = V2 T1 T2

Charles’s Law (Gay-Lussac’s Law)

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

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

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

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?

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?