Use a graphical approach (either by hand, with graph paper, or electronically-prepared, perhaps with Excel) and the Clausius-Clapeyron equation with the vapor pressure data below to determine the molar enthalpy of vaporization for this substance in kilojoules/mole. Your graph and work must be shown for full credit.  The data you graph will be derived (as discussed in class) from the values below.  I have provided a blank worksheet to lead you to the correct information to graph.  Also, predict the normal boiling point (in oC) for this substance and show your work.                                                                                        Temperature (oC) Pvap (torr) Temp (K) 1/T (K-1) Ln Pvap -74.3 1.00       -48.1 10.0       -27.7 40.0       -11.5 100.       17.9 400.           Final answers:                           ______________  (graph must be attached, with axes labeled and all five data points shown)                                     ______________ (slope of the line on your Clausius-Clapeyron graph)               ______________ calculated Hvap in kJ/mole, based on your graph   ______________ predicted normal boiling point, in oC, based on your graph

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter11: Intermolecular Forces And Liquids
Section: Chapter Questions
Problem 38GQ: The following data are the equilibrium vapor pressure of limonene, C10H16, at various temperatures....
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  1. Use a graphical approach (either by hand, with graph paper, or electronically-prepared, perhaps with Excel) and the Clausius-Clapeyron equation with the vapor pressure data below to determine the molar enthalpy of vaporization for this substance in kilojoules/mole. Your graph and work must be shown for full credit.  The data you graph will be derived (as discussed in class) from the values below.  I have provided a blank worksheet to lead you to the correct information to graph.  Also, predict the normal boiling point (in oC) for this substance and show your work.                                                                                    

   Temperature (oC)

Pvap (torr)

Temp (K)

1/T (K-1)

Ln Pvap

-74.3

1.00

 

 

 

-48.1

10.0

 

 

 

-27.7

40.0

 

 

 

-11.5

100.

 

 

 

17.9

400.

 

 

 

 

 

Final answers:

             

            ______________  (graph must be attached, with axes labeled and all five data points shown)

                       

            ______________ (slope of the line on your Clausius-Clapeyron graph)

 

            ______________ calculated Hvap in kJ/mole, based on your graph

 

______________ predicted normal boiling point, in oC, based on your graph

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