The products formed in several reactions are given below. Identify the reactions (labeled x and y) and write the complete balanced equation for each reaction. a) x + y -> (NH4)2SO4(aq) b) x + y -> Mg(NO3)2(aq) + CO2(g) + H2O(l) c) x + y -> BaSO4(s) + NaCl(aq) d) x + y -> NH4{+}(aq) + OH{-}(aq)