Carry out the transformations: 1) phosphorus-phosphorus oxide-phosphoric acid-sodium phosphate

Carry out the transformations: 1) phosphorus-phosphorus oxide-phosphoric acid-sodium phosphate 2) phosphorus-phosphine-phosphorus oxide 3) carbon-methane-carbon monoxide six 4) carbon-carbon monoxide two-carbon monoxide four-calcium carbonate

P → P2O5 → H3PO4 → Na3PO4
1) 4P + 5O2 → 2P2O5 (compound reaction);
2) P2O5 + 3H2O → 2H3PO4 (compound reaction);
3) 2H3PO4 + 3Na2SO4 → 2Na3PO4 + 3H2SO4 (exchange reaction).

P → PH3 → P2O5
1) 4P + 6HCl → 2PH3 + 2PCl3 (substitution reaction);
2) 2PH3 + 4O2 → P2O5 + 3H2O (substitution reaction).

C → CH4 → CO2
1) C + 2H2 → CH4 (compound reaction);
2) CH4 + 2O2 → CO2 + 2H2O (substitution reaction).

C → CO → CO2 → CaCO3
1) 2C + O2 → 2CO (compound reaction);
2) 2CO + O2 → 2CO2 (compound reaction);
3) CO2 + CaO → CaCO3 ↓ (compound reaction).