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c161l12_10_03

# c161l12_10_03 - Mixtures of gases Remember our assumptions...

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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 Dalton’s Law of Partial Pressures The total pressure of a system is equal to the pressures exerted by the individual gases contained in that system

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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 / Σ n = χ A mole fraction

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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

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c161l12_10_03 - Mixtures of gases Remember our assumptions...

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