Складіть електронний баланс реакції:
NaNO 3 + H 2 SO 4 + Cu  NO 2 + CuSO 4 + Na 2 SO 4 + H 2 O
Na 2 SO 3 + O 2  Na 2 SO 4
H 2 SO 3 + Cl 2 + H 2 O  H 2 SO 4 + HCl
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