[Read 27 January 1913.] 
Mr Kleeman, The Atomic Constants, ete. 
175 
— The Atomic Constants and the Properties of Substances. By 
‘R. D. Kireman, B.A., Emmanuel College, D.Sc. (Adelaide). 
THE quantity of a substance, where p denotes its density 
i 
and m the molecular weight of a molecule relative to that of the 
hydrogen atom, is the volume of a gram molecule of the substance, 
and accordingly proportional to the molecular volume of a molecule. 
“Tt has long been known that it is approximately an additive 
quantity of the atom for substances at their boiling points at 
_ atmospheric pressure. It is evident, however, from the investiga- 
i 
f 
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tions of the law of corresponding states in connexion with the law 
of molecular attraction by the writer, that the molecular volumes 
obtained for corresponding states are likely to be of greater value - 
TABLE I. 
Values of Cy. 
H=1, C=2034, O0O=2298, F=2098, Cl=4105, 
Br=5:805, I1=7:7734, Sn=859. 
m 
-and importance. Table I contains the values of — for a number 
| 
Hexamethylene | 307:5 | 340°3 
Name of substance 7 14-062, , Name of substance a 14:06 ¢, 
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Di-isopropyl 356-7 | 368-4 | Stannic Chloride 351-6 | 351-6 
Di-isobuty] 482-2 | 482-2 || Benzene 256°2 | 256:2 
Pentane 310-3 | 311-7 || Ether 284-1 | 287-3 
Tsopentane 307-7 | 311-7 || Propyl formate 288°5 | 29]: 
Hexane 367-5 | 368-4 || Propyl acetate 344°9 | 348-2 
Heptane 4927-6 | 425-1 || Carbon dioxide 94°8 | 93-2 
Octane 490-4 | 482-2 || Ethyl butyrate 420-4 | 404-9 
Fluor benzene 271-4 | 271-4 || Methyl acetate 231:3 | 234°8 
Bromo benzene | 323°5 | 235-5 || Carbon tetrachloride | 276-2 | 259-4 
Todo benzene 350-6 | 350-6 || Methyl formate 17250) | 17830 
Chloro benzene | 307'8 | 299-6 | Hydrochloric acid 61:4 73°7 
