Lab 4.2.pdf - 4-2 Heat of Vaporization of Water A graph of...

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4-2: Heat of Vaporization of Water A graph of the vapor pressure of a liquid as a function of temperature has a characteristic shape that can be represented fairly accurately with the Clausius-Clapeyron equation. In this assignment you will measure the vapor pressure of water at several temperatures and then use this data to estimate the heat of vaporization of water using the Clausius-Clapeyronequation. 1.Start Virtual ChemLab, select Colligative Properties,and then select Heat of Vaporization of Waterfrom the list of assignments. The lab will open in the Gases laboratory. 2.The balloon is filled with 0.10 moles of water vapor at a pressure of 140 kPa and a temperature of 400 K. Pull down the lever on the Temperature LCD controller until the temperature stops decreasing. This temperature represents the equilibrium temperature where water as a gas exists in equilibrium with water as a liquid. The pressure at this temperature is the vapor pressure. Record the vapor

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