Table 9.1 lists the thermodynamic properties of saturated liquid and vapor tetrafluo-roethane. Making use of the vapor pressures as a function of temperature and of the saturated-liquid and saturated-vapor volumes, calculate the latent heal 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) 5((F),
(b) 30((F),
(c) 55((F),
(d) 80((F),
(e) 105((F),