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Balance the following chemical reactions by writing the correct coefficient for each reactants and product.
1) ____Al2Ol3 (s) ---> ____Al(s) + ____O2 (g)
2) ____Cu1Cl2 (s) + ____H2S2 (aq) --> ____H1Cl1 (aq) + ____Cu1S1(aq)
3) ____Na<sub>1 (s) + ____Br2 (l) ---> ____Na1Br1 (s)
4)