# Chapter 11 Intermolecular Forces and Liquids - Study Questions - Page 435b: 22

#### Work Step by Step

Performing a regression, we obtain: $ln\ P(mmHg)=-4637.8\ K/T(K)+18.173$ From the Clausius-Clapeyron equation, it follows: $\Delta H_v=-4637.8\ K×-0.008314\ kJ/mol.K=38.56\ kJ/mol.K$

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