СРОЧНО!!!
Подберите коэффициенты методом электронного баланса.
1. SO2 + HNO3 → H2SO4 + NO
2. H2O + Cl2 → HCl +O2
3. Fe2O3 + H2 →Fe + H2O
4. H2SO4 + S → SO2 + H2O

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