Metallic Compounds of Chlorine, Bromine, and Iodine. 



401 



Vss 19.7 . . 19.8 . . 21.6 



1 2.372 . . 3.084 . . 2.000 



Heat of comb. . . 436°.7 • 436°.2 . 444°.0 



Mean heat referred to iodine as unit, 439°. 

 Mean heat referred to zinc as unit, 1720°. 



19- To ascertain in the preceding cases the heat due to the solution of the 

 compound, portions of each, carefully dried, were introduced into the thin glass 

 balls, and the weight accurately ascertained, while the normal proportion of water 

 for their solution was placed in the glass vessel. 



20. Chloride of zinc and water, Zn CI -\- Aq. 



Mean heat referred to chlorine as unit, 292°. 

 Mean heat referred to zinc as unit, 320°. 



21. Bromide of zinc and water, Zn Br -j- Aq. 



Th. air 



T' 



T 



Inc. c 



Aq 



Sn. (sp. heat 0.62) 



Vss 



Zn Br . . . . 

 Heat of comb. . , 



54°.00 



53°.86 



56°.36 



2°. 51 



153.9 gm 



9.1 



19.4 



5.077 



127° 



55°.50 

 55°.35 

 57°.4I 



2°.06 

 154.9 gm. 



7.7 

 19.4 



4.310 

 122° 



VOL. XIX. 



Mean heat referred to bromine as unit, 124°.5. 

 Mean heat referred to zinc as unit, 302°. 



3 F 



