# Gas Variables. Pressure 1. Caused by collisions between molecules and the walls of container. 2. Force per unit area; changing force of collisions or.

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Gas Variables

Pressure 1. Caused by collisions between molecules and the walls of container. 2. Force per unit area; changing force of collisions or area changes pressure. 3. Units: 1 atm = 101.3 kPa = 760 mm Hg (torr) = 14.7 lbs/in 2 (psi)

Volume 1. Determined by space between molecules. Molecules themselves are assumed to have no volume. 2. As molecules bounce more vigorously, spacing widens. 3. Units: mL, liters

Temperature 1. Directly proportional to average kinetic energy of molecules: 12mv 2 = cT 2. Must be Kelvin for gas law calculations.

Amount 1. Perhaps surprisingly, number, not mass, of molecules determines gas properties. 2. Moles.

Avogadros Law: Volume and Number of moles are directly proportional. Minor Gas Laws

Avogadros Law: Volume and Number of moles are directly proportional. Minor Gas Laws

Avogadros Law: Volume and Number of moles are directly proportional. Minor Gas Laws

Boyles Law: Pressure and Volume are inversely proportional. Minor Gas Laws

Boyles Law: Pressure and Volume are inversely proportional. Minor Gas Laws

Charles Law: Volume and Temperature are directly proportional. Minor Gas Laws

Charles Law: Volume and Temperature are directly proportional. Minor Gas Laws

Daltons Law: Pressure and Number of moles are directly proportional. Minor Gas Laws

Gay-Lussacs Law: Pressure and Temperature are directly proportional. Minor Gas Laws

In summary… Minor Gas Laws

The five minor gas laws can be combined by focusing on the one law that is different… Combining the Gas Laws Boyles Law P1V1=P 2 V2 Avogadros Law Charles Law Daltons Law Gay- Lussacs Law

This is called the COMBINED GAS LAW. Combining the Gas Laws

OR, if only one set of data exists, a single useful equation results… The Ideal Gas Laws

When the five minor gas laws are combined, a single useful equation results… The Ideal Gas Laws In this equation, P should be in atm V should be in liters n should be in moles T should be in Kelvin R is the gas constant… 0.0821

The Ideal Gas Laws

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