Откуда появилась 5 у Н2SO4 в начале. понятно расскажите.
+1+6-2 0 +2+6-2 +1-2 +1-2
5H2SO4 + 4Zn = 4ZnSO4 + H2S + 4H20

0 +2
Zn -2e = Zn | 4
+6 -2
S +8e = S | 1
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