Collisions with gas particles are elastic.

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Presentation transcript:

Collisions with gas particles are elastic. Ideal Gases Assumptions: Gases consist of tiny particles that are far apart. Collisions with gas particles are elastic. Gas particles are in constant, rapid motion. There are no forces of attraction between gas particles

Real Gases Do Not Behave Ideally Real gases DO experience inter-molecular attractions Real gases DO have volume Real gases DO NOT have elastic collisions

Real Gases are not “ideal”…. At high pressure At very low temperature For very large or polar molecules

Ideal Gas Law relates the amount of gas (n, number of moles), volume (V), temperature (T), and pressure (P).   T = Temperature in Kelvin

Ideal Gas Law v. Combined Gas Law If there are “moles” (or “mass”) in your gas law problem, then use the IDEAL GAS LAW. If there are no “moles” (or “mass”), then use the COMBINED GAS LAW.

Ideal Gas Law Problem #1 What pressure in atmospheres (atm) will 18.6 mol of methane exert when it is compressed in a 12.00 L tank at a temperature of 45°C? PV = nRT  

Ideal Gas Law Problem #1 PV = nRT  

Ideal Gas Law Problem #2 Calculate the number of moles of gas contained in a 3.0 L vessel at 300 K and a pressure of 152 kPa. PV = nRT  

Ideal Gas Law Problem #2 PV = nRT  

Ideal Gas Law Problem PV = nRT  

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