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molar mass of vapor lab - Kris Kelly Lab Report 6 CHEM 121L...

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Kris Kelly Lab Report 6 CHEM 121L 10/23/07 Introduction/Background: In this experiment, an unknown liquid will be evaporated and condensed within an Erlenmeyer flask by placing it in a boiling water bath. Evaporation is the process of a liquid going from a liquid to a gas. Condensation is the opposite process where a gas becomes a liquid. The condensed liquid will be less in quantity than that of the original unknown liquid. Key Data: Unknown Liquid = B Mass of Erlenmeyer flask, rubber band, and aluminum foil 78.0983g Barometric Pressure of atmosphere 765.5 mmHg 1.00723 atm Temperature of Boiling Water 100 ° C Mass of Flask, rubber band, aluminum, and condensed vapor 78.3337g Mass of Condensed Liquid .2354g Volume of Flask 150 ml Molar Mass of Vapor 47.75 g/mol Results: Molar Mass of Vapor 47.75 g/mol Unknown liquid = B Table result for vapor = Ethanol
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Sample Calculations: PV=nRT (1.00723 atm)(.150L) = n(.0821 L*atm/mol*K)(373 K) n=.00493 mol unknown liquid MM= .2354 g / .00493 mol MM=47.75g g/mol Conclusion/Sources of Error:
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