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Balance the following chemical equations
i). `Mg + O_2 -> MgO`
ii). `Mg + N_2 -> Mg_3N_2`
iii). `Al + HCl -> AlCl_3 + H_2`
iv) `C_3H_8 + O_2 -> CO_2 + H_2 0`

Answer Text:
i).`2Mg_(s) + O_(2(g)) ->2MgO_(s)`
ii).`3Mg_(s)+ N_(2(g)) ->Mg_3N_(2(s))`
iii).`2Al + 6HCl(aq) ->2AlCl_(3(aq)) + 3H_(2(aq))`
iv). `C_3H_(8(g)) + 5O_(2(g)) -> 3CO_(2(g)) + 4H_2 0(l)`