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Si no quiere usar fracciones se multiplica por 2 :
2 Fe(s) + 6 HCl(ac) → 2FeCl3(ac) + 3 H2(g)
Al(OH)3(ac) + 3 HCl(ac) → AlCl3(ac) +3 H2O(I)
2 Na + 1/2 O2 → Na2O O se multiplica por 2 : 4 Na + O2 → 2 Na2O