c161l12_10_03 - Mixtures of gases Mixtures of gases W...

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Unformatted text preview: Mixtures of gases Mixtures of gases W Remember our assumptions for the molecular model? W Each gas particle behaves independently from each other particle W Each particle occupies the entire volume W Pressure depends on the number of collisions, whether there is one kind of gas or ten W Daltons Law of Partial Pressures The total pressure of a system is equal to the pressures exerted by the individual gases contained in that system Partial Pressure Partial Pressure W P T =P A + P B + P C + W P A =n A RT/V W P T = n A RT/V + n B RT/V + n c RT/V + W P T = (n A + n B + n C + )RT/V W P A /P T = (n A RT/V)/((n A +n B +n C +)RT/V) = n A /(n A +n B +n C +) W n A / n = A mole fraction Collection gases over water Collection gases over water W At every temperature some water evaporates W When air has as much water as it will hold, it is called saturated (100% relative humidity) W The pressure exerted by a gas from an evaporated liquid is called its vapor pressure W Volumes of gases are frequently measured by displacing water Example...
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This note was uploaded on 04/06/2011 for the course CHEMISTRY 161 taught by Professor Seigel during the Fall '10 term at Rutgers.

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c161l12_10_03 - Mixtures of gases Mixtures of gases W...

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