Table 9.1 lists the thermodynamic properties of saturated...

Table 9.1 lists the thermodynamic properties of saturated liquid and vapor tetrafluoroethane. Making use of the vapor pressures as a function of temperature and of the saturated-liquid and saturated-vapor volumes, calculate the latent heat of vaporization by Eq. (4.11) at one of the following temperatures and compare the result with the value calculated from the enthalpy values given in the table. (a) $258.15 \mathrm{~K}\left(-15^{\circ} \mathrm{C}\right),($ b $) 272.15 \mathrm{~K}\left(-1^{\circ} \mathrm{C}\right),($ c $) 286.15 \mathrm{~K}\left(13^{\circ} \mathrm{C}\right),(d) 300.15 \mathrm{~K}\left(27^{\circ} \mathrm{C}\right)$, (e) $313.15 \mathrm{~K}\left(40^{\circ} \mathrm{C}\right)$.

Table 9.1 lists the thermodynamic properties of saturated liquid and vapor tetrafluoroethane. Making use of the vapor pressures as a function of temperature and of the saturated-liquid and saturated-vapor volumes, calculate the latent heat of vaporization by Eq. (4.11) at one of the following temperatures and compare the result with the value calculated from the enthalpy values given in the table.
(a) $258.15 \mathrm{~K}\left(-15^{\circ} \mathrm{C}\right),($ b $) 272.15 \mathrm{~K}\left(-1^{\circ} \mathrm{C}\right),($ c $) 286.15 \mathrm{~K}\left(13^{\circ} \mathrm{C}\right),(d) 300.15 \mathrm{~K}\left(27^{\circ} \mathrm{C}\right)$,
(e) $313.15 \mathrm{~K}\left(40^{\circ} \mathrm{C}\right)$.

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Key Concepts

Latent Heat of Vaporization

This concept refers to the amount of energy required to convert a unit mass of a substance from the liquid phase to the vapor phase at constant temperature and pressure. It is an important property in thermodynamics that helps in understanding the energy changes during phase transitions and is often determined using experimental data or derived from theoretical equations like the Clausius-Clapeyron relation.

Clausius-Clapeyron Equation

The Clausius-Clapeyron equation establishes a relationship between the vapor pressure and the temperature of a substance during a phase change. It relates the slope of the pressure-temperature curve (dP/dT) to the latent heat of vaporization and the change in specific volume between the vapor and the liquid. This equation is fundamental in analyzing phase equilibria and calculating latent heat from thermodynamic data.

Saturation Properties

Saturation properties pertain to the conditions under which a substance exists in equilibrium between two phases, such as liquid and vapor. They include values like saturated-liquid volume, saturated-vapor volume, and vapor pressures at various temperatures. Understanding these properties is crucial for determining phase change characteristics and analyzing processes involving boiling, condensation, and evaporation.

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