Ch.11 - Liquids, Solids & Intermolecular ForcesWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The following table gives the vapor pressure of hexafluorobenzene (C6 F6 ) as a function of temperature: Temperature (K ) Vapor Pressure (torr)280.032.42300.092.47320.0225.1330.0334.4340.0482.9By plot

Solution: The following table gives the vapor pressure of hexafluorobenzene (C6 F6 ) as a function of temperature: Temperature (K ) Vapor Pressure (torr)280.032.42300.092.47320.0225.1330.0334.4340.0482.9By plot

Problem
The following table gives the vapor pressure of hexafluorobenzene (C6 F6 ) as a function of temperature:


 Temperature (K ) Vapor Pressure (torr)
280.032.42
300.092.47
320.0225.1
330.0334.4
340.0482.9


By plotting these data in a suitable fashion, determine whether the Clausius-Clapeyron equation is obeyed. If it is obeyed, use your plot to determine Hvap for C6 F6.

Solution

We are asked to determine the Hvap for C6F6

We’re given a table of the vapor pressure at five different temperatures. 


 Temperature (K )

 Vapor Pressure (torr)

280.0

32.42

300.0

92.47

320.0

225.1

330.0

334.4

340.0

482.9



For this problem, we can use the Clausius-Clapeyron Equation:


lnP2P1 = -HvapR1T2-1T1

 

where:

P1 = vapor pressure at T1

P2 = vapor pressure at T2

ΔHvap = heat of vaporization (in J/mol)

R = gas constant (8.314 J/mol•K)

T1 and T2 = temperature (in K).


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