The equation 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 $P_2$ and $P_1$ are the vapor pressures at temperatures $T_2$ and $T_1$ respectively, $\Delta H_{\text{vap}}$
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