Experiment 2 - Experiment 2 Vapor Pressure of Liquids Lacey...

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Experiment 2: Vapor Pressure of Liquids Lacey Frigaard Lab Partner: Sam Thompson February 5, 2008 Section: 13 Purpose: To determine the relationship between the vapor pressure of a liquid and its temperature by using a Pressure Sensor and temperature Probe. Also, to determine the heat of vaporization of methanol using the Clausius-Clapeyron Equation.
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I. DATA AND CALCULATIONS Atmospheric Pressure: 98.9 kPa Table 1: Temperature and Pressure Data Substance Methanol Methanol Methanol Methanol Ethanol Trial 1 2 3 4 1 Temp (C) 23.6 31.1 12.6 4.1 23.4 Temp (K) 296.6 304.1 285.6 277.1 296.4 Measured Pressure (kPa) 112.4 122.1 103.6 96.8 103.7 Air Pressure (kPa) (no correction) 98.9 (corrected) 101.4 (corrected) 95.2 (corrected) 92.4 (no correction) 98.9 Vapor Pressure (kPa) 13.5 20.7 8.4 4.4 4.8 II. PROCESSING THE DATA AND OBSERVATIONS 1. Temp in K = Temp in C + 273 2. (P1/T1) = (P2/T2) (P1/T1)*T2 = P2 corrected Allow P1 and T1 to be the Air Pressure and Temperature in Kelvin for Trial 1. T2 will vary for trials 2 through 4. Calculate P2, the corrected air pressure, for trials 2 through 4 only.
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