It is given by:
\[\ln\left(\frac{P_2}{P_1}\right) = -\frac{\Delta H_{\text{vap}}}{R} \left(\frac{1}{T_2} - \frac{1}{T_1}\right)\]
where:
- \(P_1\) is the vapor pressure of the substance at temperature \(T_1\),
- \(P_2\) is the vapor pressure of the substance at
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