Journal of Thermodynamics

Research Article

Corollary from the Exact Expression for Enthalpy of Vaporization

Table 3

Volumes and radii of molecules in spherical model.
Sample 𝑇 𝑐 𝑃 𝑐 𝑉 𝑐 ( 𝑑 𝑃 / 𝑑 𝑇 ) 𝑐 𝑉 0 𝑟 𝑎 𝑟 𝑇 𝛿 1 𝑟 𝑊 𝛿 2
Ne44,40026,54 4,18 3,3118,471,601,642,511,7710,5
Ar150,8648,987,45 1,8533,221,921,993,892,1411,7
Kr209,3954,97 9,20 1,4839,611,982,116,822,3016,2
Xe289,7458,2811,83 1,1348,232,182,263,602,5014,7
NH3405,6113,0 7,25 1,8230,921,821,956,922,1216,6
CH4190,5546,419,90 1,3438,872,002,105,082,3617,9
Li3800968,36,94 1,6213,871,551,493,822,0935,1
𝑇 𝑐 is the critical temperature (K), 𝑃 𝑐 *10−5 is the critical pressure (Pa), 𝑉 𝑐 *105 is the critical (geometric) volume (m3/mole), ( 𝑑 𝑃 / 𝑑 𝑇 ) 𝑐 *10−5 (Pa/K) is taken in a critical point, 𝑉 0 is the effective molecule volume, 𝑟 𝑎 *1010 (m) are the molecule radii taken from publications [1], 𝑟 𝑇 *1010 (m) are the calculated molecule radii, 𝑟 𝑊 *1010 (m) are the molecule radii obtained from Van der Waals equation, and 𝛿 1 and 𝛿 2 are the errors for 𝑟 𝑇 and 𝑟 𝑊 , respectively.