The Combined Gas Law and the Ideal Gas Law

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Presentation transcript:

The Combined Gas Law and the Ideal Gas Law Sections 2 The Combined Gas Law and the Ideal Gas Law

Objectives State the relationship among temperature, volume, and pressure as the combined gas law. Apply the combined gas law to problems involving the pressure, temperature, and volume of a gas Relate the amount of gas present to its pressure, temperature, and volume by using ideal gas law Apply the ideal gas law to problem solving

Key Terms Combined gas law Ideal gas constant, R Ideal gas law Avogadro’s principle Molar volume

The Combined Gas Law P1V1 = P2V2 T1 T2

Practice Problem A balloon has a volume of 2.1 L at 0.998 atm and 36 ºC. Upon being released, the pressure drops to 0.815 atm and 28 ºC. What is the new volume?

Avogadro’s Principle Moles are proportionate to V, at constant T and P.

Ideal Gas Law: Combines Boyle, Charles, Gay-Lussac, Avogadro PV = nRT

PV=nRT P  atm V  L n  mols R  0.08206 L-atm/mol-K T  Kelvin

Practice Problem If the pressure exerted by a gas at 25 °C in volume of 0.044 L is 1950 torr, how many moles of gas are there?

When given grams… Convert grams to mols Use the mol value for n

When solving for grams Solve for n (mols) Convert mol to grams

Practice Problem Calculate the grams of nitrogen present in a 0.600 L sample at 1.00 atm and 22.0 ºC.

Homework Combined and Ideal Gas Law Worksheet