1. NH3 → N2 → NO → NO2 → NaNO3
2. P → P2O5 → Na3PO4
3. Ca3(PO4)2 → P → Mg3P2 → PH3 → P2O5 → H3PO4
4. C → CH4 → CO2 → ВаCO3 → CO2
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