## Chemistry and Chemical Reactivity (9th Edition)

a) $70.3°C$, because that's the temperature at which the vapor pressure equals the atmospheric pressure. b) Performing a regression, we find: $ln\ P=-3881.4/T_K+17.94$ Solving for the temperature: $250\ mmHg: 39.5°C$ $650\ mmHg: 65.5°C$ c) From the Clausius-Clapeyron equation, it follows: $\Delta H_v=-3881.4\ K×0.008314\ kJ/mol.K=32.27\ °C$