Vapor Pressure and Heat Evaporation Lab Report Essay

1170 Words Apr 5th, 2013 5 Pages
Vapor Pressure and Heat of Vaporization Introduction:
Evaporation is the process of a liquid becoming vaporized. When a liquid is placed into a confined space some of the liquids will evaporate. Evaporation of the liquid depends on the strength of the intermolecular forces that are between liquid molecules. During the evaporation process of the liquid, new gas molecules exerts pressure in the sealed container, while some of the gas condenses back to the liquid state. If the temperature inside the container is kept constant, then the equilibrium at some point will be reached. When the equilibrium is reached, the rate of condensation is equal to the rate of evaporation and the rate of vapor pressure will remain constant as long as
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Place the Temperature Probe in the water bath and monitor the pressure and temperature readings. The twelfth step is to add a small amount of hot water to warm the water bath by only a few degrees. Stir the water with the temperature probe and monitor the pressure and temperature readings. For the thirteenth step, repeat step twelve until five trials are completed. Add hot water for each trial so the temperature of the water bath increases. After the fifth trail is recorded, open the valve to release the pressure in the flask and dispose of the alcohol as directed. The fifteenth step is to end the data collection and record the pressure and temperature readings in the data table. When recording the data, record the pressure valve of the first data point as Pair for trials one and two and record the temperature for trial one. Record the pressure value of the second data point as Ptotal for trial two as well as the temperature. The remaining values are recorded as Ptotal for trial two as well as the appropriate temperature. The last and final step is to clean the work area.

Data Table:
Methanol

Trial 1
Trial 2
Trial 3
Trail 4
Trail 5
Ptotal (mmHg) 103.1
104.5
105.8
101.9
Pair (mmHg)
101.3
102.4
103.3
104.4
105.2
Pvap (mmHg) 0.7
1.2
1.4
2.7
Temperature (Celsius)
22.6
25.8
28.3
31.2
34.0

Ethanol Trial 1
Trial 2
Trial 3

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