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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) ____Ca1(O1H1)2 (aq) + ____H1(N1O3)1 (aq) --> ____H2O1 (g) + ____Ca1(N1O3)2 (aq)
3) ____Na1 (s) + ____Br2 (l) ---> ____Na1Br1 (s)
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