
Concept explainers
Four alcohols have the formula
Compound |
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Normal boiling point
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|
|
|
|
|
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Isobutanol |
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tert-Butanol |
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Using the Clausius-Clapeyron equation, rank the isomers of butanol in order of decreasing vapor pressure at

Interpretation:
The isomers of butanol are to be ranked in order of decreasing vapor pressure. Also the validation of the fact that the ranking agrees with the conventional wisdom based on
Concept introduction:
The Clausius-Clapeyron equation is obtained from the rearrangement and integration of Clapeyron equation. The Clausius-Clapeyron equation is generally used for gas-phase equilibria, to predict the equilibrium temperatures and pressures and also for the determination of enthalpy for phase transition.
Answer to Problem 6.33E
The decreasing order of vapor pressures of isomers of butanol is
On comparison of the vapor pressure of isomers of butanol, the value of vapor pressure decreases with the increase in the values of enthalpy of vaporization and normal boiling point.
Explanation of Solution
The table containing the data for the isomers of butanol is shown below.
Compound | Normal boiling point |
|
Isobutanol | ||
tert-Butanol |
Table 1
To calculate the vapor pressure of the given isomers of butanol the formula used is,
Where,
•
•
•
Substitute the values of enthalpy of vaporization, vapor pressure at normal boiling point that is
Thus, the vapor pressure of
Similarly, substitute the values of enthalpy of vaporization, vapor pressure at normal boiling point that is
Thus, the vapor pressure of
Similarly, substitute the values of enthalpy of vaporization, vapor pressure at normal boiling point that is
Thus, the vapor pressure of isobutanol at
Similarly, substitute the values of enthalpy of vaporization, vapor pressure at normal boiling point that is
Thus, the vapor pressure of tert-butanol at
The decreasing order of vapor pressures of isomers of butanol is
On comparison of the vapor pressure of isomers of butanol, the value of vapor pressure decreases with the increase in the values of enthalpy of vaporization and normal boiling point.
The decreasing order of vapor pressures of isomers of butanol is
On comparison of the vapor pressure of isomers of butanol, the value of vapor pressure decreases with the increase in the values of enthalpy of vaporization and normal boiling point.
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Chapter 6 Solutions
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