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Unformatted text preview: Click to edit Master subtitle style CHEM 230 F09 Lecture 4 Chapter 4: Gases 14.9-14.14 Putting the P into Pchem Session ID: 230 Topics Pressure • Measurement • Units Gas Laws • Relationships between pressure, volume, moles, and temperature • Ideal Gas Law • Calculations including density and molar mass • Solving stoichiometric problems Involving gas volumes • Standard Temperature and Pressure STP: standard temperature & pressure = 0oC (273.15 K) & 1 atm NIST = 0oC (273.15 K) & 1 bar IUPAC Volume (L) of 1 mole of gas at standard ambient temperature (25oC) and pressure (1 bar) Concept Question The density of a gas in a closed container will increase if: A. The pressure of the gas increases under constant temperature. B. The temperature of the gas increases under constant pressure. C. Both answers are correct. Concept Question The density of a gas in a closed container will increase if: A. The pressure of the gas increases under constant temperature. B. The temperature of the gas increases under constant pressure. C. Both answers are correct. Today’s Topics Gas Mixtures Law of Partial Pressures (Define: Mole fraction) Molecular Motion Diffusion Effusion Kinetic Model of Gases Root-mean-square speed of a gas Maxwell Distribution of Speeds Partial Pressures The total pressure from a mixture of gases is the sum of the pressures of the individual components • Ptotal = P1 + P2 + P3 + ... + Pfinal Mole Fraction O bj1 0 O bj1 0 1 O bj1 0 2 Concept Question A mixture of gases has a pressure of 5 atm. It was prepared from 28 g of N2, 4 g of H2 and 32 g O2. What is the partial pressure of H2? A. 0.3 atm B. 1 atm C. 2 atm D. 2.5 atm E. 4 atm Concept Question A mixture of gases has a pressure of 5 atm. It was prepared from 28 g of N2, 4 g of H2 and 32 g O2. What is the partial pressure of H2?...
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## This note was uploaded on 03/29/2010 for the course CHEMISTRY 230 taught by Professor Gottfried during the Fall '10 term at University of Michigan.

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