The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure...
The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure data are obtained: Temperature 270.6K and 287.5K, Pressure 324.5 mmHg and 626.9 mmHG. Calculate the enthapy of vaporization ( delta H vap ) in kJ/mol for this liquid.
Homework Answers
1) Let us use the Clausius-Clapeyron Equation:
ln (P1 / P2) = (?H / R) (1/T2 - 1/T1)
with the following values:
| P1 = 324.5 mmHg | T1 = 270.6 K |
| P2 = 626.9 mmHg | T2 = 287.5 K |
2) Set up equation with values:
ln (324.5/ 626.9) = (x / 8.31447) (1/287.5 minus 1/270.6)
-0.658 = (x / 8.31447) (-0.000217)
5.4708 = 0.0001217x (notice I got rid of the negative signs)
x =44953 J/mol = 44.95 kJ/mol
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