File:Boiling pressures.png

Boiling pressures by Clausius–Clapeyron and physical constants refs cited below

Cl_2 curve seems closest to Freon. Molecular mass is another important parameter,

mu = 	70.906 (Cl2), 86.5 (Freon), 44.097 propane; Freon closest here too

Latent heat (boiling), in J/g
 * Cl2: 288 J/g
 * Freon: ~ 200 J/g
 * Propane: 428 J/g


 * Sources
 * https://www.concoa.com/chlorine_properties.html
 * https://www.engineeringtoolbox.com/propane-d_1423.html
 * https://www.thermalfluidscentral.org/encyclopedia/index.php/Thermophysical_Properties:_Freon%C2%AE-22
 * http://www.chegg.com/homework-help/questions-and-answers/vapor-pressure-data-freon-12-ccl2f2-common-refrigerant-122-c-20-atm-161-c-50-atm-424-c-100-q1140027