Vapor Pressure of Carbon Dioxide Temp *F Vapor pressure psia -39.1 147.0 -2.0 29

Question

Vapor Pressure of Carbon Dioxide

Temp *F       Vapor pressure psia

-39.1           147.0

  -2.0           293.9

  22.5           440.9

The example of 2-1 is: Plot the vapor pressure of n-hexane in a way that will result in a straight line.

Temperature *F              Vapor Pressure of n-hexane psia

157.7                                   14.7

199.4                                   29.4

269.1                                   73.5

331.9                                 147.0

408.9                                 293.9

454.6                                 435.0

Explanation / Answer

As per the relation , the plot of ln P Vs 1/T gives a straight line.

the equation ia ln P= -3618*1/T +13.58 , T is in R

at 40 deg.F , T= 40+460=500

lnP= -3618/500 +13.58=6.344, P= 569 mm Hg

2. lnP vs 1/T gives a straight line ( T in R). The ploy is shown below

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