Na2S ← Na→ Na2O2→ Na2 О→ NaOH → NaCl→ Na NO3

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It appears that the progression here is starting with sodium sulfide (Na2S) and then going through a series of chemical reactions to ultimately end up with sodium nitrate (NaNO3).

Na2S (sodium sulfide) can react with oxygen (O2) to form sodium peroxide (Na2O2).Sodium peroxide (Na2O2) can then react with water (H2O) to form sodium hydroxide (NaOH).Sodium hydroxide (NaOH) can then react with hydrochloric acid (HCl) to form sodium chloride (NaCl).Finally, sodium chloride (NaCl) can react with silver nitrate (AgNO3) to form sodium nitrate (NaNO3).

This progression showcases a series of chemical reactions involving sodium compounds that lead to the formation of sodium nitrate.