Equations! Equations! Equations! Mathematicians please assist me.?

1) 2Pb(NO3)2(s) ----> 2PbO(s) + 4NO2(g) + O2(g) all the metal nitrates, except group I) decompose like this to the oxide with 4NO2 + O2 2) Bromine is more reactive than iodine so displaces it from compounds Br2(aq) + 2I-(aq) --> I2(aq) + 2Br-(aq) 3) There are two half equations Na - e- ---> Na Br2 + 2e- ---> 2Br- overall double the first and add 2Na(s) + Br2(g) ---> 2Na+Br-(s).

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