5. In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100°C is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: 201 Flask Volume Mass of Flask + Cap Mass of Flask + Condensed Liquid Mass of Condensed Liquid Temperature of Water Bath (oC) Barometric Pressure (atm) 100.0 + 100.0 + 79.6 mL 279.6 mL 143.85 g 144.95 g 1.10 g 84.1 °C 0.985 atm a. What is the molar mass of the unknown? b. What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL?

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter11: Solutions
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short, 1-minute survey.
DISMISS
5. In the Dumas method for determining the molar mass of an unknown volatile liquid,
a sample of a volatile liquid that boils below 100°C is vaporized in a boiling water bath
and the mass of the vapor required to fill the flask is determined. The following data
was collected:
4oFlask Volume
100.0 + 100.0 + 79.6 mL = 279.6 mL
Mass of Flask + Cap
Mass of Flask + Condensed Liquid
Mass of Condensed Liquid
Temperature of Water Bath (°C)
Barometric Pressure (atm)
143.85 g
144.95 g
1.10 g
84.1 °C
0.985 atm
a. What is the molar mass of the unknown?
b. What will its temperature be when the pressure is 1.20 atm and the volume is
250.0 mL?
Transcribed Image Text:short, 1-minute survey. DISMISS 5. In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100°C is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: 4oFlask Volume 100.0 + 100.0 + 79.6 mL = 279.6 mL Mass of Flask + Cap Mass of Flask + Condensed Liquid Mass of Condensed Liquid Temperature of Water Bath (°C) Barometric Pressure (atm) 143.85 g 144.95 g 1.10 g 84.1 °C 0.985 atm a. What is the molar mass of the unknown? b. What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL?
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