b. Using Excel or Google Sheets, graph In VP vs. 1/T. Let In VP be the ordinate (vertical axis). Calculate the best straight line through the points on the graph. c. Use the equation of the line to determine the molar heat of vaporization. Show your calculations in the space below. Slope = = -AH/R vap (Hap = J/mol)

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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using the table, fill out the following questions on the page (B-E)

1.
The vapor pressure of an unknown liquid was measured as described in this experiment:
Temp.
°℃
5.5
21.3
41.0
a.
Pressure Measurements
(mm Hg)
Observed
773.1
837.0
983.3
Air Pressure
731.3
736.7
750.5
VP
(mm Hg)
41.8
83
100,3
232.8
In VP
3.7 3
4.61
5.45
Temp.
(in Kelvin)
27815 k<
1/T
314.0
0.0036
294,3k 0.0034
0.0032
Fill in the rest of the table above. The observed vapor pressure is actually the sum of
the vapor pressure of the unknown liquid and the pressure of air in the flask. In order
to determine the vapor pressure of liquid you need to subtract the air pressure from the
observed pressure. Note that the pressure of air in the flask changes with temperature.
Show your calculations in the space below.
Transcribed Image Text:1. The vapor pressure of an unknown liquid was measured as described in this experiment: Temp. °℃ 5.5 21.3 41.0 a. Pressure Measurements (mm Hg) Observed 773.1 837.0 983.3 Air Pressure 731.3 736.7 750.5 VP (mm Hg) 41.8 83 100,3 232.8 In VP 3.7 3 4.61 5.45 Temp. (in Kelvin) 27815 k< 1/T 314.0 0.0036 294,3k 0.0034 0.0032 Fill in the rest of the table above. The observed vapor pressure is actually the sum of the vapor pressure of the unknown liquid and the pressure of air in the flask. In order to determine the vapor pressure of liquid you need to subtract the air pressure from the observed pressure. Note that the pressure of air in the flask changes with temperature. Show your calculations in the space below.
Vapor Pressure and Heat of Vaporization of Liquids
48
b. Using Excel or Google Sheets, graph In VP vs. 1/T. Let In VP be the ordinate (vertical axis).
Calculate the best straight line through the points on the graph.
C.
Use the equation of the line to determine the molar heat of vaporization. Show your
calculations in the space below.
Slope =
= -AH/R
(Hap
d. Define boiling point:
1/T =
e. If the barometric pressure of the lab was approximately 760 mm Hg, find the normal
boiling point of the liquid from the equation of the line. (Hint: Find 1/T when VP = 760
mm Hg. Calculate T in °C.)
T =
J/mol)
T=
K
°C
Transcribed Image Text:Vapor Pressure and Heat of Vaporization of Liquids 48 b. Using Excel or Google Sheets, graph In VP vs. 1/T. Let In VP be the ordinate (vertical axis). Calculate the best straight line through the points on the graph. C. Use the equation of the line to determine the molar heat of vaporization. Show your calculations in the space below. Slope = = -AH/R (Hap d. Define boiling point: 1/T = e. If the barometric pressure of the lab was approximately 760 mm Hg, find the normal boiling point of the liquid from the equation of the line. (Hint: Find 1/T when VP = 760 mm Hg. Calculate T in °C.) T = J/mol) T= K °C
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