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Molecular Weight Determination by Vapor Method

# Molecular Weight Determination by Vapor Method - Chemistry...

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Chemistry 1120 Molecular Weight Determination by Vapor Method Data Table Unknown number 28326 Trial 1 Trial 2 Mass of flask + cap + band 97.603 g 130.238 g Temperature of boiling H 2 O ( ° C) 97.1 ° C 97.1 ° C Temperature of boiling H 2 O (K) 370.25 K 370.25 K Mass of flask + cap + band + condensed liquid 98.137 g 130.692 g Mass of condensed liquid 0.534 g 0.454 g Atmospheric pressure 660.7 mm Hg 0.8693 atm Molecular weight (MW) of unknown 68.5 g/mol 56.3 g/mol Average molecular weight 62.4 g/mol Calculations 1. The calculation for obtaining the mass of the condensed liquid left in your flask after it was removed from the boiling water bath for trial 2. 130.692 g (mass of flask + cap + band + condensed liquid) – 130.238 g (mass of flask + cap + band) = 0.454 g (mass of condensed liquid) 2. The calculations to obtain the pressure, volume, and temperature values you used in the ideal gas law (equation 1) for trial 2. Pressure = 660.7 mm Hg × 1 atm = 0.8693 atm 760 mm Hg Volume = 94.1 mL + 99.0 mL + 88.7 mL = 281.8 mL × 1 L = 0.2818 L 1000 mL Temperature = 97.1 ° C (classes average boiling point) + 272.15 K = 370.25 K 3.

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Molecular Weight Determination by Vapor Method - Chemistry...

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