Question

Na→ Na²O→ NaOH
P→ P²O³→ H³PO⁴

Answer 1

1. Na—>Na2O—>NaOH
1) 4Na+O2=2Na2O
2) Na2O+H2O=2NaOH
2. P->P2O3->H3PO4
1) 4P+3O2=2P2O3
2)P2O3+3H2O=2H3PO4