Corollary from the Exact Expression for Enthalpy of Vaporization

Table 4

Volumes and linear dimensions for twoatomic molecules in ellipsoidal model.

Sample	𝑇𝑐	𝑃𝑐	𝑉𝑐	(𝑑𝑃/𝑑𝑇)𝑐	2𝑐	𝑉0	𝐴	𝑏
H2	33.23	13.16	6.39	1.87	0.74	12.49	1.47	1.43
N2	126.25	33.96	8.95	1.56	1.10	41.75	2.20	2.13
O2	154.77	50.87	7.34	1.92	1.21	35.18	2.09	2.01
F2	144.00	52.20	6.62	2.25	1.42	36.83	2.15	2.03
Cl2	417.17	77.09	12.38	1.12	1.99	58.04	2.54	2.34
CO	132.94	34.98	9.36	1.50	1.13	43.88	2.24	2.17

𝑇_𝑐 is the critical temperatrue (K), 𝑃_𝑐*10⁻⁵ is the critical pressure (Pa), 𝑉_𝑐*10⁵ is the critical (geometrical) volume (m³/mole), (𝑑𝑃/𝑑𝑇)_𝑐*10⁻⁵ (Pa/K) is taken at the critical point, 𝑉₀*10³⁰ (m³) is the calculated inaccessible molecule volume, 2𝑐*10¹⁰ (m) is the distance between the atoms in the molecule, and 𝑎*10¹⁰ and 𝑏*10¹⁰ (m) are the major and minor semiaxes of ellipsoid.