Gases and the Kinetic Molecular Theory. Speeds of gas molecules. For a single molecule. Kinetic energy is: KE = ½ mv 2 m = mass; v = velocity For a collection.

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Presentation transcript:

Gases and the Kinetic Molecular Theory

Speeds of gas molecules. For a single molecule. Kinetic energy is: KE = ½ mv 2 m = mass; v = velocity For a collection of gas molecules, the average kinetic energy is: R = ideal gas constant = J/K  mol T = temperature in Kelvin

How fast do gas molecules move? Called the root mean square speed of the gas. What is the rms speed of O 2 molecules at room temperature? in kg/mol Equation gives speed in meters/second.

Boltzmann Distributions

Boltzmann Distributions and Molar Mass

Boltzmann Distributions and Temperature

Gas Diffusion

Gas Effusion

Graham’s Law of Gas Effusion: used for determining molar mass of a gas

Example: A sample of ethane, C 2 H 6, effuses through a small hole at a rate of 3.6 x mol/hr. An unknown gas, under the same conditions, effuses at a rate of 1.3 x mol/hr. Calculate the molar mass of the unknown gas.

Gas Laws: The Ideal Gas Law PV = nRT P = pressure in atmospheres V = volume in liters N = moles of gas T = temperature in K R = gas constant = L  atm/K  mol Two Uses: 1. You know three of the four variables and solve for the fourth. 2. You know the change in one variable and determine the change in another.

The Ideal Gas Law: 1a: Determining one property, given the others A sample of N 2 gas has a volume of 250. mL, a pressure of 720 mm Hg, and is at 25 o C. What is the mass of the gas?

The Ideal Gas Law: 1b: Determining one property, given the others A sample of 2.60 g Ar gas has a pressure of 720 mm Hg, and is at 25 o C. What is the volume of the gas?

The Ideal Gas Law: 1c: Determining one property, given the others What is the density of O 2 gas at 20 o C, in grams per liter?

The General Gas Law: Determining changes in a property when a different property changes. General idea: cancel properties that don’t change.

The General Gas Law: P and V A gas sample at 0.95 atm has a volume of 250 mL. What will the pressure be if the volume is compressed to 100 mL? n and T are constant. General Law:

The General Gas Law: n and V A 0.35 mol gas sample has a volume of 250 mL. What will the volume be if 0.20 mol more gas are added? P and T are constant. General Law:

The General Gas Law: T and V A gas sample has a volume of 250 mL at 100 o C. What will the volume be if it is cooled to 10 o C? P and n are constant. General Law:

The General Gas Law: T and V A car tire has a pressure of 32 psi in winter, when T = -10 o C. What will the pressure be in summer if T increases to 33 o C, but 5% of the air in the tire has leaked out? Assume V is constant.