(55 ) 
Solution : Cu(NO;)2 — 2.24 GV °/,; 
HNO; = 2.52 GV ©, (40). 
Temps Nombre Poids du zinc Perte du poids du zinc 
en de 
heures. séries. A ae gra ee en 9/0. 
4 4 42,2670 10,9852 1,2818 
2 12,268 41,0296 1,2352 
2 2,5318 22,0148 2,5170 10.26 
2 1 11,6142 9,9459 1,6683 
2 11,6095 10,0304 4,5791 
2 93,2237 19,9763 3,24#74 13.98 
3 1 41,6083 9,8730 1,7353 
2 41,6314 9,8188 41,8126 
2 23,2397 19,6918 3,5419 45.26 
4 1 42,0313 9,626 2,3171 
2 A1,9 #73 9,8073 2,1400 
2 23,9786 49,4609 4,5177 18.84 
ÿ | 41,9198 9,5537 2,30661 
2 11,8562 9,5401 2,3111 
2 23,1160 19,0988 4,6712 19.67 
6 4 11,5929 9,2487 2,3142 
2 41,0216 9,2395 2,382 
2 23,245 18,4582 4,1563 20.48 
16 1 11,8229 7,9814 3,8H15 
2 41,9463 7,867 4,0788 
2 93,1692 |  15,8489 1,9203 33,32 
