Experiment 2 part 2

# Experiment 2 part 2 - VAPOR PRESSURE OF WATER Measure the...

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Recitation February 1 1 VAPOR PRESSURE OF WATER Measure the vapor pressure of water at different temperatures and calculate the heat of vaporization of water. Clausius Clapeyron equation: C T 1 R H P P ln vap 0 - - = y = a x + b Obtain the vapor pressure of water at several temperatures. P 0 = 1 atm Plot ln P versus 1/T. The slope is - H vap / R.

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Recitation February 1 2 Set up: 1. Beaker with water 2. Inverted graduated cylinder, filled with water, with a 2 mL air bubble. 3. Thermometer, clamped to a stand. 4. Hot plate. 5. Available ice in a beaker. 1. Invert graduated cylinder and remove finger/stopper/film fast. 2. Add ice to water in beaker and remove some water until temperature = 0 o C. 3. Register the volume of air and the exact temperature.
Recitation February 1 3 Calculate moles of air trapped: RT V P n atm air = using barometer measured in graduated cylinder using thermometer; near 0 C in L.atm.K -1 .mol -1 Assumption: The number of moles of air will not change throughout your experiment.

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