HEAT AND HEAT OF TRANSFORMATION OF IODIDE OF SILVER. H71 
AgL 
T. 
Q. 
Difference. 
No. 
t, 
Observed. 
Calculated. 
r« 
1 
°C. 
15-67 
°C. 
67-68 
2-994 
2-990 
+ 0-004 
°c. 
14-1 
2 
14-72 
75-28 
3-489 
3-497 
-0-008 
12-9 
3 
14-03 
110-68 
5-713 
5-705 
+ 0-008 
11-6 
4 
14-97 
138-66 
7-430 
7-434 
-0-004 
110 
5 
20-68 
163-15 
14-90 
14-87 
+ 0*03 
13-0 
6 
19-13 
162-7 
14-90 
14-93 
-0-03 
11-4 
7 
2101 
264-0 
20-66 
20-67 
-0-01 
11-4 
8 
22-11 
259-5 
20-38 
20-35 
+0-03 
11-0 
9 
21-87 
259-7 
20-35 
20-37 
-0-02 
11-6 
From these data we have calculated the mean specific- heat c of Agl between any 
two temperatures t and T below 142°, the specific heat c Y after change of structure, 
and the latent heat of change X, supposing that the change happens at 150° C. 
c=0-054389+ 0-0000372 (T + 0 
Cl =0-0577 
1=6-25. 
The table shows also the calculated values for Q. 
Cu 2 I 2 .12AgI. 
From 0° to 95° O., very slight expansion. 
„ 95° „ 124° O., neither expansion nor contraction. 
„ 124° „ 228° O., notable contraction. 
„ 228° ,, 502° O., rapid expansion. 
Our calorimetric results are given in the following table :— 
Cu 3 I 3 .12 Agl. 
No. 
T. 
Q. 
Difference. 
t. 
Observed. 
Calculated, 
r. 
10 
°C. 
15-13 
°C. 
88-51 
4-321 
4-316 
+ 0*005 
°c. 
12-7 
11 
16-69 
88-81 
4-238 
4-242 
-0-004 
14-3' 
12 
23-67 
233-2 
20-53 
20-58 
-0-05 
12-2 
13 
24-00 
234-3 
20-67 
20-62 
+ 0-05 
12-5 
14 
26-27 
338-4 
26-56 
26-52 
+0-04 
11-5 
15 
24-81 
327-9 
• 25-97 
26-00 
-0-03 
10-4 
c=0"05882 (mean, from 16° to 89°) 
^=0-0580 
1=8*31 (at 160°). 
