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Published byMyles Riddles Modified over 3 years ago

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Gas Variables

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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)

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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

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

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

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

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

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

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

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

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

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

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

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

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In summary… Minor Gas Laws

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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

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

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

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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

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The Ideal Gas Laws

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Ideal Gas Law PV=nRT Kinetic Molecular Theory 1. Gases have low density 2. Gases have elastic collisions 3. Gases have continuous random motion. 4. Gases.

Ideal Gas Law PV=nRT Kinetic Molecular Theory 1. Gases have low density 2. Gases have elastic collisions 3. Gases have continuous random motion. 4. Gases.

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