By S. Bretsznajder
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Extra info for Prediction of Transport and Other Physical Properties of Fluids
Example text
31) fails t o allow adequately for the influence of various atomic groups in the molecule. The practical utility of estimates of physico-chemical properties based on intermolecular force constants is, therefore, rather limited. The essential value of these considerations consists in the elucidation of the theoretical links existing between the properties of the individual molecules such as dipole m o ment, polarizability, molecular weight, etc. e. compressibility, viscosity, thermal conductivity a n d diffusivity.
Solution The molar refraction RO of fluorobromobenzene may be calculated by summing the bond and atomic contributions 6 contributions of carbon 6x2-418 = 14-508 4 contributions of hydrogen 4x1-100 = 4-400 1 contribution of bromine 8-865 1 contribution of fluorine 0-810 3 contributions of double bonds 3 x 1-733 = 5 199 The calculated value of RO for fluorobromobenzene is 33-782 The experimentally determined values of the refraction RO for the fluorobromobenzenes are /w-fluorobromobenzene 30-82 o-fluorobromobenzene 31-81 /7-fluorobromobenzene 31-21 The differences between the calculated and measured values for the individual isomers are considerable.
19. 9 110 12-0 8-3 10-5 120 Vb (cm /mole) OF A L I Q U I D A T ITS B O I L I N G P O I N T , BAS Fluorine Chlorine Bromine Sulphur Ring three-membered four-membered five-membered six-membered naphthalene anthracene 8-7 21-6 27-0 25-6 -60 -8-5 -11-5 -150 -300 -47-5 3 M O L A L VOLUMES Hydrogen H 2 Oxygen 0 2 Nitrogen N 2 Nitric oxide NO Nitrous oxide N 2 0 Hydrogen sulphide H 2S Air Carbon monoxide CO Vb (cm /mole) OF SOME LIQUEFIED G A S E S 14-3 25-6 31-2 23-6 36-4 32-9 29-9 30-7 Ammonia N H 3 Chlorine Cl 2 Bromine Br 2 Iodine I 2 Water H 2 0 Carbon dioxide C 0 2 Sulphur dioxide SO z 25-8 48-4 53-2 71-5 18-9 340 44-8 Molal Volumes of Hydrocarbons.