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Presentation19_061117

# Presentation19_061117 - Chem 6A Presentation#19 Overview...

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Chem 6A Presentation #19 2006-11-17 1 Overview Chapter 4: The Properties of Gases Standard conditions Molar volume and density of gases Gas mixtures Effusion and diffusion Kinetic-particle theory of gases

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2 The ideal gas law Ideal gas: exhibits simple linear relationships among: Pressure ( P ) Volume ( V ) Temperature ( T ) Amount, in moles ( n ) The ideal gas law relates these variables: R = 8.314 Pa·m 3 ·mol –1 ·K –1 = 8.314 J·mol –1 ·K –1 = 0.08206 atm·L·mol –1 ·K –1 Most simple gases behave nearly “ideally” under moderate conditions. PV nT = R R is the gas constant
3 Standard conditions Standard ambient temperature and pressure (SATP) : T = 25.00°C = 298.15 K P = 1 bar = 100,000 Pa Standard temperature and pressure (STP) : T = 0.00°C = 273.15 K P = 1 atm = 760 torr = 101,325 Pa

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4 Molar volume and density of gases V m = RT P d = m V = nM V d = MP RT
5 Gas mixtures and partial pressure (Dalton's law) For a mixture of gases A, B, C, . .. : P total = P A + P B + P C + . .. Each partial pressure is the same as the pressure the component gas would exert if present by itself. Each gas behaves independently; pressure depends only on n:

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Presentation19_061117 - Chem 6A Presentation#19 Overview...

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