FLUIDITY AND THE CHEMICAL COMPOSITION

TABLE XXV.—ABSOLUTE TEMPEEATTJRES AND SLOPES OF NON-ASSOCIATED
SUBSTANCES COKBESPONDING TO A FLUIDITY OF 200 C.G.S. UNITS

Substance
Absolute tempera-•ture (<j> = 200) observed
Difference CH2
Slope at
(4> = 200)
Absolute temperature (<£ - 200) calculated
Per cent, difference

Hexane ..............
(255 I)1 \

(2 88)
254 6
0 2

Heptane .............
276 . 1 /
(21.0)

277 3
0 4

Octane ...............
299 . 1 }
23 0
2 44
300 0
0 3

Isohexane .............
(249.0) \

(2 79)
247 0
0 8

Isoheptane
269 2 /
(20.2)
2 68
269 7
0 2

Methyl iodide .
290 2
19 0
1 92
287 4
1 0

Ethyl iodide . .
309 2 \

1 80
310 1
0 3

Propyl iodide .........
332.7 f
23.5
1 82
332 8
0 0

Isopropyl iodide ........
324.5 \

1 92
325 2
0 2

Isobutyl iodide
345 5 /
21.0
1 86
347 9
0 7

Allyl iodide. . .
330 5

1 82
328 8
0 5

Ethyl bromide.
268 7

2 22
273 5
1 8

Propyl bromide ...
296.6
27.9 .
2 08
296 2
0.1

Isopropyl bromide ... .
289.4

2 22
273 5
1.8

Isobutyl bromide .......
315.0
25.6
2 08
311.3
1.1

Ethyl propyl ether
(255 0)

(2 70)
256 1
0 5

Dipropyl ether
279 0
(24.0)
2 62
278 8
0 1

Methylisosbutyl ether. . . Ethylisobutyl ether .....
(251.1) 270.1
(19.0)
(2,75) 2.68
248.5 271.2
1.0
0.4

Values in parentheses are extrapolated.

TABLE XXVI.—THE VALUE OF THE ISO-GKOUPING

Substance
Temperature observed, normal grouping
Temperature observed, iso-grouping
Difference

Hexane ...........
255.1
249.0
6.1

Heptane ..
276 1
269 2
6.9

Propyl iodide
332 7
324 5
8.2

Propyl bromide . . . Propyl chloride. . . . Butyric acid
296.6 261.5 381.6
289.4 255.2 371.6
7.2 6.3 10.0

Methyl butyrate . .
304.2
295.8
8.4

j

The value for the hydrogen atom is calculated as follows: