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vapor pressure

# vapor pressure - For the given equation ln P vap = A – B...

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Name: Ron Lampkins Partner: Jenny Charlton Instructor: Mr. Lee Date Performed: 11-12-04 Date Submitted: 11-19-04 Vapor Pressure Objective: To determine the vapor pressure curve for a liquid as a function of temperature. Experimental Data: P bar = 713 + 5 mmHg Temperature ( C) Length (cm) 0 5.0 10 5.3 20 5.5 30 6.3 40 6.8 50 7.4 Sample Calculation: P vap = [L – ({T 2 / T 1 } * L 1 ) / L] * P atm P vap = [5.3cm – ({283K / 273K} * 5.0cm) / 5.3cm * 713 mmHg P vap = 15.7 mmHg Results and Conclusions: Temperature ( C) Vapor Pressure (mmHg) 0 0 10 15.7 20 17.3 30 84.9 40 112.0 50 143.2 According to the table above, as the temperature increases, the pressure increases as well.
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Unformatted text preview: For the given equation: ln P vap = A – B / T A = 5.25 B = -1. Discussion of Discrepancy and Experimental Uncertainty: The most obvious source of experimental uncertainty was caused by the inexact spacing of the alcohol liquid in the capillary tube. This in turn would skew the results for the length values and would therefore, alter the calculated vapor pressures at each temperature....
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