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b) (2)N2 + (3)O2 - (2)N2O3
c) (2)H2 + O2 - 2H2O
d) (2)N2O5 - (2)N2+(5)O2
e) (2)Al + (3)Cl2 - (2)AlCl3
f) (2)FgCl3 - (2)Fe + (3)Cl2
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