Question

PH3---P2O5---CO2---Na2CO3---NaHCO3---Na2CO3--- NaOH---NaHSO4---Na2SO4

Answer 1

2PH₃+4O₂=P₂O₅+3H₂O
2P₂O₅+5C=4P+5CO₂
CO₂+Na₂O=Na₂CO₃
Na₂CO₃+H₂O+CO₂=2NaHCO₃
2NaHCO₃=t=Na₂CO₃+H₂O+CO₂
Na₂CO₃+Ba(OH)₂=2NaOH+BaCO₃
NaOH+H₂SO₄=NaHSO₄+H₂O
NaHSO₄+NaOH=Na₂SO₄+H₂O