Problem: 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 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.

FREE Expert 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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Problem Details
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.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Clausius-Clapeyron Equation concept. You can view video lessons to learn Clausius-Clapeyron Equation. Or if you need more Clausius-Clapeyron Equation practice, you can also practice Clausius-Clapeyron Equation practice problems.

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