Question

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Answer 1

14.В
15.Ca + 2HCl → CaCl2 + H2
2Na + 2HCl → 2NaCl + H
2Al + 6HCl → 2AlCl3 + 3H2
HG + HCl = HGCl + H2
16.Дано:
M(Fe2O3)=160
M(Fe2)=112
Решение:
w=112/160=0.7 или 70%