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Balance the following chemical reactions by writing the correct coefficient for each reactants and product.
1) ____Na1(O1H1)1 (aq) + ____H1Cl1 (aq) --> ____H2O1 (g) + ____Na1Cl1 (aq)
2) ____Na2O1 (s) + ____C1O2 (g) ---> ____Na2(C1 O3)1 (s)
3) ____H2O1 (l) + ____Fe (s) ---> ____Fe2O3 (s) + ____H2 (g)