# 15. According to the Clausius-Clapeyron equation ln va R T T P"арф) refers to the vapor...

###### Question:

15. According to the Clausius-Clapeyron equation ln va R T T P"арф) refers to the vapor pressure at temperature 1, R-2 cal/mol-K, and Ah is the heat of changc associated with the process of transitioning to the vapor (cither sublimation or vaporization depending on whether the transition is from solid to vapor or liquid to vapor) i.e., дН-H vapor-H , where X is either solid or liquid and H denotes the corresponding molar enthalpy. Use the Clausius-Clapeyron equation to solve the ollowing problems. a. The vapor pressures for sublimation of ice at T 269 K and 271 K are 3.280 mm Hg and 3.880 mm Hg, respectively. Use this information to estimate the heat of sublimation of ice. (Note that sublimation refers to the process of solid-to-vapor transitions. Also, if you prefer to work in Pa, note that 1 mm Hg-133.32 Pa) b. The vapor pressures for vaporization of water at T- 275 K and 277 K are 5.294 mm Hg and 6.101 mm Hg, respectively. Use this information to estimate the heat of vaporization of water. (Notc that vaporization refcrs to thc proccss of liquid-to- vapor transitions) c. Estimate, AHfusion(Hsolid - Hliquid) the heat of fusion of ice. d. Estimate the triplc point pressure and tempcraturc Pt and Tt of water. Notc that at the triplc point temperature Tt the sublimation pressure of the solid and the vapor pressure of the liquid are equal

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