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This experiment aims to determine the molar mass of an unknown volatile liquid using the ideal gas law. The procedure involves vaporizing the liquid, measuring its mass, volume, pressure, and temperature, and then applying the formula mw = drt/p to calculate the molecular weight. The experiment includes a detailed procedure, data collection, and analysis, with calculations for density and molecular weight. Potential sources of error, such as vapor leakage and incomplete condensation, are discussed, along with suggestions for improvement. The experiment concludes by identifying the unknown compound as acetone based on the calculated molecular weight and comparison with known compounds. Useful for chemistry students learning about gas laws and experimental techniques in determining molecular weights.
Typology: Lab Reports
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The purpose of this experiment is to measure the molar mass of unknown volatile liquid and identity it. The reaction was carried out by following method: https://www.youtube.com/watch?v=YXQocxXmt-E The equation used in this experiment are: Density = mass / volume MW = dRT /P Where MW = Molecular weight P = Pressure of the room in atm
d = Density, grams of liquid divided by volume of container T = Temperature of boiling water in kelvin R = Universal gas constant
Name Chemical Formula Hazard Acetone CH 3 COCH 3 N/A
R= 0.08206 L atm / mol K Trial 1 Trial 2 Initial mass of flask 126.07 44 g 126.0744 g Volume of flask 0.280 L 0.280 L Pressure 0.9966 atm 0.9966 atm Temperature of boiling water 367 K 369.5 K Mass of flask after condensation 126.5011 g 126.5902 g
In this experiment, we learned how to determine the molecular weight of an unknown volatile liquid. We correctly determined the molecular weight of the unknown liquid, and based on our possible compounds, we can conclude that it is acetone. The 11.86% inaccuracy could be due to vapors escaping from the hole in the foil. It could be due to incomplete condensation, gas, or some other human mistake. It can be improved by implementing specific procedures. Nonetheless, we successfully identified the unknown compound.