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Vapor Pressure

# Vapor Pressure - Discussion of Experimental Uncertainty...

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Vapor Pressure Objective : To determine the vapor pressure curve for a liquid as a function of temperature. Experimental Data : Liquid Y: 2 cm Liquid Z: 2.5 cm Length of bubble: 4.5 cm Temperature (C*) Length of vapor space 5 4 cm 10 4.3 cm 20 4.5 cm 30 4.9 cm 40 5.3 cm 50 6.4 cm Sample Calculations : P vap = [L 2 - (T 2 /T 1 ) x L 1 ] x P atm L 2 K= 5*C +273 = 278K K= 10*C + 273 = 283K P vap = [43 mm – (283 K/278 K) x 40 mm ] x 724 43 mm P vap = [43 mm – 40.72 mm ] x 724 43 mm P vap = 0.05 x 724 P vap = 36.2 Results and Conclusions : Temperature (C*) Length of vapor space P vap (mmHg) 5 4 cm 0 10 4.3 cm 36.2 20 4.5 cm 45.7 30 4.9 cm 79.9 40 5.3 cm 108.7 50 6.4 cm 198.0 In the first graph, the relationship between vapor pressure and temperature is exponential where Pvap increase with T. In the second graph, Vapor pressure vs. the inverse of temperature in Kelvin, it is a linear graph.

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Unformatted text preview: Discussion of Experimental Uncertainty : There were a couple specific uncertainties in this lab. One of them was that the view of the bubble when measuring it was skewed through two other tubes. Also, another uncertainty could be that we are assuming that at 0*, there is not vapor pressure. This could not exactly be the case, especially since the vapor pressure in between 5* and 10* jumped to 36.2 mmHg. Vapor Pressure vs. Temperature 36.2 45.7 79.9 108.7 198.0 50 100 150 200 250 10 20 30 40 50 60 T1 (C*) vapor pressure (mmHg) Pvap Vapor pressure vs. 1/ temperature 36.2 45.7 79.9 108.7 198.0-50 50 100 150 200 250 0.003 0.0031 0.0032 0.0033 0.0034 0.0035 0.0036 0.0037 1/T (K) Pvap Linear (Pvap)...
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