Lacey_Che131_S2012_Lect-18s

Lacey_Che131_S2012_Lect-18s - Gas Density Buoyancy depends...

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Lec-18: Dalton’s Law; Kinetic Molecular Theory Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Gas Density Buoyancy depends on differences in gas densities. Depends on: 1. Molar Masses He( g ) = 0.169 g/L* ( )g / N 2 ( ) = 1.19 g/L* 2. Temperature harles’sLaw : Charles s Law: density as Temp. * At 15 C and 1 atm. P m M Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 RT V d = = Example When HCl( aq ) and NaHCO 3 ( ) are mixed together, a reaction takes place in which a gas is one of the products. The gas has a d = 1.81 g/L at 1.00 atm and 23 ° C. What is the molar mass and entity of the gas? identity of the gas? P m M = = 3 HCl NaHCO +⎯ RT V d dRT T = 273 + 23 = 296 K P = 1 atm 0.082 L atm 296 1.81 mo l 1a tm gK = γ M P = M Kmo 1 atm = 44 g L Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 Daltons Law ` For a mixture of gases in a container ` P Total = P 1 + P 2 + P 3 + . . . Depends on total moles of gas, not the identity of the gas. Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4
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Daltons Law ` Mole Fraction: the ratio of the number of moles of a given component in a mixture to the total number of moles in a mixture. = n ole Fraction in terms of pressure ( = PV/RT Χ 1 1 = n 1 n TOTAL n 1 + n 2 + n 3 + ••• Mole Fraction in terms of pressure ( n = PV/RT ) /RT) Χ 1 = P 1 (V/RT) P 1 (V/RT) + P 2 (V/RT) + P 3 (V/RT) + ••• Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 5 Daltons Law By substitution: o: ...
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Lacey_Che131_S2012_Lect-18s - Gas Density Buoyancy depends...

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