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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)#