Chemistry Practice Problems Clausius-Clapeyron Equation Practice Problems Solution: The vapor pressure of carbon tetrachloride is meas...

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Solution: The vapor pressure of carbon tetrachloride is measured as a function of temperature and the results are tabulated and shown in the table below. Determine the heat of vaporization of carbon tetrachloride from the results.Temperature  (K)Pressure  (torr)25511.326521.027536.828561.529599.0300123.8

Problem

The vapor pressure of carbon tetrachloride is measured as a function of temperature and the results are tabulated and shown in the table below. Determine the heat of vaporization of carbon tetrachloride from the results.


Temperature  (K)Pressure  (torr)
25511.3
26521.0
27536.8
28561.5
29599.0
300123.8



Solution
  • Heat of vaporization can be solved using the Clasius-Clapeyron equation where:

  • Where P is pressure (any unit will do as long as P1 and P2 have the same unit) and T is temperature in K. ΔHvap is heat of vaporization in J/mol while R is gas constant (8.314 J/mol K)

  • Plugging in the values of P and T from the table provided (I'll be using 255 K and 265 K but any will do):

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