l420 ACADÉMIE DES SCIENCES. 



Données accessoires (tirées de Berthelot, Thermochimie, 1897, t. II) : 



3° 4Hgliq. + 40 gaz. = 4HgOsol. + ^3; 



4° Az^gaz. + SH^gaz. = aAzH^diss. 4- ^4; 



5» 3 H'^ gaz. + 30 gaz. = 3 H^ liq. + q~, ; 



60 Az^gaz. +Hg4iq.+ 0gaz. =:(AzHg2)20sol + ^. 



^,= + i5iC»\o; ^2= +i54''"^6; 5-3= 4 X 21 ,5 = + 86C"i,o; 



^4= 2 X 21 ,0=r:42(^''\o; ^5 = 3 X 69 , O == 207^'-^',0. 



On en tire x = q^+ q-^ + rj,^— {g^-h c/~^) = — 70'^«i,4- 

 Deuxième système de cycles. 



Az^gaz. + HgMiq. + O gaz. = ( AzHg2)20 sol. + x. 

 V> (AzHg--')2 0sol. + 24KCAzdiss. = + ry, ; 



2° 4Hg (C Az)-diss, + 16 KCAz diss. = + </,. 



Données accessoires : 



3° 4Hgliq. + 4(GAz)2gaz. =: + ^;,; 



4° 2 Az gaz. + 3H2gaz. := 2 Az IF diss. + q,^\ 



5" 4(CAz)2gaz. +8H gaz. =r8GAzH diss. + rj^; 

 6° 8GAzH diss. + 8K0H diss. = + ^/g-, 



7° H-gaz. -i- O gaz. = FPO liq. -h ^-7. 



y,i=-M5iC^'i,o; r/,= + 52<>i,4; <73=r4x4 = + 33C''',6; q,= [^i^^\o; 

 ^5= 4 X 2.5, 1 = ioo'^''i,4; «76= 8 X 2,96 = 23'^"', 68; ^7= 69'^"',o. 



On en lire .3; = (^2 +73+ ^v+Ç't) — (^1 + ^:;+ Vf.) = — 75*^'^',3. 

 Troisième système de cycles : 



1° 4Hgliq. +40gaz. =:4HgOsol. +^,; 



2° Az'' gaz. + 3H- gaz. = 2 AztP diss. + q^] 



3° 4H2gaz. + 40gaz. =:4IPOsol. + ^3; 



4° IP gaz. + gaz. =IPO liq. +^4; 



5° 4HgOsol. + aAzH^diss. + H201iq. =; (AzHg-)20 4II-O sol. + r/g (hypothèse); 



6° (AzHg2)20 sol. + 4IPO sol. ^ (AzHg2)^0 4H20 sol. + q,. 



g^=-^S6^'Ko] ^2= + 42'^''',o; ^3= + 28iCai,6; 

 ^4= + 69^'-'',o; ^5= + i3«--'i,4; ^6= + 5C'"\4- 



On en tire pour Az- gaz. + HgMiq. + O = (AzHg-)-O + x. 



^ = (^'l + ^2 + 7V + ^3 ) — (^3 + ^6) = — 76''"'w • 



Chaleur de formation des hydrates. — Déterminations directes faites au calori- 

 mètre : 



1° (AzHg^)20 sol. + 24KCAz diss. = + i5iC«i,o; 



2° (AzHg)20,H20sol. + 24KCAzdiss. = + i48'^-i,o; 



3° (AzHg2)20,4H20 sol. + 24IvCAz diss. = + i4oCai,2; 



4° (AzHg2)20, 5H-0 sol. + 24KCAZ diss. =: + i37Cai,8; 



5° (AzHg2)2 0,9,5H2 0sol. + 24KCAz diss. = + r36c»',6. 



