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1. S + H2 --> H2S
2. 2H2S + 3O2 --> 2SO2 + 2H2O
3. 2SO2 + O2 --> 2SO3
4. SO3 + H2O --> H2SO4
Ad. 2
1. N2 + 3H2 --> 2NH3
2. 2NH3 + H2SO4 --> (NH4)2SO4
3. (NH4)2SO4 + 2NaOH --> Na2SO4 + NH3↑ + 2H2O
4. 8NH3 + 6NO2 --> 7N2 + 12H2O
Ad. 3
1. 4P + 5O2 --> 2P2O5
2. P2O5 + 3H2O --> 2H3PO4
3. H3PO4 + 3NaOH --> Na3PO4 + 3H2O
4. 2Na3PO4 + 3CaCl2 --> Ca3(PO4)2 + 6NaCl