Ideal+Gas+Law

An ideal gas is defined as one in which all collisions between atoms or molecules are perfectly elastic and in which there are no intermolecular attractive forces. One can visualize it as a collection of perfectly hard spheres, which collide but which otherwise, do not interact with each other. 

Gases are made up of a large number of small particles (atoms or molecules), all of which are in constant, random motion. The rapidly moving particles constantly collide with each other and with the walls of the container.

Ideal gases have molecular volume and show no attraction between molecules at any distance; real gas molecules have volume and show attraction at short distances. Let us first consider what pressure does. Pressure at high degrees will bring the molecules very close together. This causes more collisions and also allows the weak attractive forces to come into play. With low temperatures, the molecules do not have enough energy to continue on their path to avoid that attraction.

Example The temperature of a sample of an ideal gas confined in a 2.0 L container was raised from 27 °C to 77 °C. If the initial pressure of the gas was 1200 mm Hg, what was the final pressure of the gas? Convert temperatures from Celsius to Kelvin K = °C + 273 Initial temperature (Ti): 27 °C K = 27 + 273 K = 300 Kelvin Ti = 300 K Final temperature (Tf): 77 °C K = 77 + 273 K = 350 Kelvin Tf = 350 K Using the ideal gas relationship for constant volume, solve for the final pressure (Pf) Pi / Ti = Pf / Tf solve for Pf: Pf = (Pi x Tf) / Ti Pf = (1200 mm Hg x 350 K) / 300 K Pf = 420000 / 300 Pf = 1400 mm Hg The final pressure of the gas is 1400 mm Hg.
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These Sites should help you understand the basic concepts of the ideal gas law. .@http://hyperphysics.phy-astr.gsu.edu/HBASE/kinetic/idegas.html @http://hyper-ad.com/tutoring/chemistry/ideal_gases_1.html

These are interactive sites @http://intro.chem.okstate.edu/1314F00/Laboratory/GLP.htm []

Works Cited http://library.thinkquest.org/12596/ideal.html http://hyperphysics.phy-astr.gsu.edu/HBASE/kinetic/idegas.html http://en.wikipedia.org/wiki/Kinetic_theory