Partial Pressures.

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Mr. ShieldsRegents Chemistry U05 L09 John Dalton (1766 – 1844) - Developed the Law of Partial Pressures (abt. 1801)

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Presentation transcript:

Partial Pressures

Dalton Each gas in a mixture exerts pressure independently of the other gases present

Dalton’s Law of Partial Pressures Total pressure of a mixture of gases is equal to the sum of the pressures of all the gases in the mixture

Partial Pressure the portion of the total pressure contributed by a single gas

Equation Ptotal = P1 + P2 + P3 …Pn

Questions A mixture of O₂, CO₂, and N₂ has a total pressure of 0.97 atm. What is the partial pressure of O₂ if the partial pressure of CO₂ is 0.70 atm and N₂ is 0.12 atm?

Questions Find the total pressure for a mixture that contains 4 gases with partial pressures of 5.00 kPa, 4.56 kPa, 3.02 kPa, and 1.20 kPa.

Questions Air is a mixture of roughly 78% N₂, 21% O₂, and 1% Ar. If the atmospheric pressure is 760 mmHg, what are the partial pressures of Nitrogen, Oxygen, and Argon in the atmosphere?