Rozwiąż chemograf :
A ---> B + Hg
+
C + D ---> Zn + H2o
( strzałki w dół pod C )
Mg + H2O ---> E + C
A HgO
B O2
C H2
D ZnO
E Mg(OH)2
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A HgO
B O2
C H2
D ZnO
E Mg(OH)2