In order to balance your equations:
The charge of a cation is equal to it's group number (not including transition metals). The charge of an anion is equal to the group number minus 8. In an ionic compound, the charge is 0.
Also it says that one of your reactants is H20 not O2; therefor, you need to show the proper amt of H on both sides.
Does the problem specifically ask for two equations? If not you only need one because one of the products is ammonia, which has hydrogen and nitrogen in it.
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