9-30-11 - Chemistry 1A F11 9.30.11 Dr. Shaka Molar Mass...

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41 Chemistry 1A F11 9.30.11 Dr. Shaka Course Code 40000 Molar Mass Determination • You should check on your own that this molar mass squares with an atmospheric composition of ~80% N 2 and ~20% O 2 , as it should. (Ar ~1%, others much smaller.) • The inert gas argon was in fact discovered by comparing “oxygen” from air with “oxygen” from a chemical reaction. • Even though the Ar is inert, chemists knew something else was in the air.
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42 Chemistry 1A F11 9.30.11 Dr. Shaka Course Code 40000 Dalton’s Law of Partial Pressures • Mixtures of gases, if they do not chemically react, behave pretty much like the same number of moles of one gas. • The molecules do not interact, bouncing around in the same way; each kind of molecule exerts a pressure on the walls of the container in an independent manner. • The partial pressure of a gas in a mixture is just the pressure you’d get for the moles of that gas only .
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43 Chemistry 1A F11 9.30.11 Dr. Shaka Course Code 40000 Molar Mass Determination • Practice Problem 5. • What is the partial pressure of oxygen in dry air at STP? Ans.
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44 Chemistry 1A F11 9.30.11 Dr. Shaka Course Code 40000 Molar Mass Determination Ans (cont). The partial pressure of molecular oxygen is 0.2095 atm at STP.
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9-30-11 - Chemistry 1A F11 9.30.11 Dr. Shaka Molar Mass...

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