Balance the Equation: __H2 + O2 → 2H2O, 1, 2, 3, 4, 10, 12, Balance the Equation: __Na + Cl2 →  2NaCl, 1, 2, 3, 4, 20, 11, Balance the Equation: __C + O2 →  CO2, 1, 2, 3, 4, 11, 12, Balance the Equation: __H2 +  N2 →  2NH3, 1, 2, 3, 4, 30, 13, Balance the Equation: __Mg + O2 →  2MgO, 1, 2, 3, 4, 22, 5, Balance the Equation: __CO2 + H2O →  H2CO3, 1, 2, 3, 4, 5, 6, Balance the Equation: __Al + 3O2 →  2Al2O3  , 1, 2, 3, 4, 5, 6, Balance the Equation: Fe + __S → FeS4, 1, 2, 3, 4, 5, 6.

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