Experiment 13

Experiment 13 - Experiment 13: Vapor Pressure and Heat Of...

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Experiment 13: Vapor Pressure and Heat Of Vaporization Kim Smith Chemistry 122 1/28/11 T.A.- Antony Akura Okumu
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Purpose: To be able to determine heat of vaporization fro an unknown sample and known liquid sample. Also to compare heats of vaporization for a series of compounds. Procedure: Refer to pages 31-33 of Laboratory Experiments in General chemistry, Volume 2 by Judith Casey and Robert Tatz, Hayden McNeil Publishing, Winter 2011- Spring 2011. Report Sheet: See attached report sheet Sample Calculations: Sample Calculations for 1/T, P s and H Δ vap : 1/T (my unknown): 28.8 + 273.15 = 301.95K 1/301.95= 0.003312 invK P S (my unknown) P S =P B (1-(V r /V)*(T/T r )) P S =749.0(1-(5.0/8.0)*(294.15/301.95)) = 2.7x10 2 mmHg ΔH vap (1-Propanol) (Y 2 -Y 1 /X 2 -X 1 )=m(slope) ΔH vap = -(slope) x R (5.97-5.79)/(0.002739-0.002754)=m Slope=-12000 ΔH vap = -(-12000) x 8.315 J *mol -1 *K -1 /1000 = 99.8kJ*mol -1
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Questions: 2. Calculate the volume of gas produced if your known sample vaporizes completely
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This note was uploaded on 02/16/2011 for the course CHEM 101 taught by Professor Stegemiller during the Spring '07 term at Ohio State.

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Experiment 13 - Experiment 13: Vapor Pressure and Heat Of...

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