Lec-25-Chap-10-2 - CHE 131 Review: Lecture 25 Gas density,...

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CHE 131 Lecture 25 – Gas density, partial pressures, real gases Chapter 10: pp. 457-467. p.458 Review: Does volume of balloon increase or decrease as it ascends into the troposphere? Example: What volume will 24.0 g O 2 (MM 32.0) occupy at 25 ° C and a pressure of 0.888 atm ? ( 24.0 g )(1 mol) n = = 0.750 mol (32.0 g) V =?; P = 0.880 atm ; T = ( 25 + 273)K = 298K V = nRT/P = ( 0.750 mol )(0.08206L × atm/mol × K)( 298K ) 0.888atm = 20.7 L Example: A student generates oxygen gas and collects it over water . If the volume of the gas is 245 mL and the barometric pressure is 756 torr at 25 o C, what is the volume of the “dry” oxygen gas at STP? ( P water = 23.8 torr at 25 o C ) P O2 = P bar - P water = ( 756 - 23.8 ) torr = 732 torr
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Example: A student generates oxygen gas and collects it over water . If the volume of the gas is 245 mL and the barometric pressure is 756 torr at 25 o C , what is the volume of the “dry” oxygen gas at STP? P water = 23.8 torr at 25 o C ; P O2 = P bar - P water = ( 756 - 23.8 ) torr = 732 torr P 1 = P O2 = 734 torr ; P 2 = SP = 760. torr V 1 = 245mL; T 1 = 298K; T 2 = ST = 273K ; V 2 = ?
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This note was uploaded on 09/04/2009 for the course CHE 81914-01 taught by Professor Prof.benjaminhsiao during the Spring '06 term at SUNY Stony Brook.

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Lec-25-Chap-10-2 - CHE 131 Review: Lecture 25 Gas density,...

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