The given chemical reactions show the conversion of iron sulfide (FeS) to silver nitrate (AgNO3) through a series of intermediate reactions.

FeS (iron sulfide) reacts with HCl (hydrochloric acid) to produce H2S (hydrogen sulfide):
FeS + 2HCl → H2S + FeCl2

H2S (hydrogen sulfide) further reacts with oxygen to produce SO2 (sulfur dioxide):
2H2S + 3O2 → 2SO2 + 2H2O

SO2 (sulfur dioxide) reacts with K2O (potassium oxide) to form K2SO3 (potassium sulfite):
SO2 + K2O → K2SO3

K2SO3 (potassium sulfite) reacts with HCl to form KCl (potassium chloride):
K2SO3 + 2HCl → KCl + H2SO3

KCl (potassium chloride) reacts with AgNO3 (silver nitrate) to produce AgCl (silver chloride) and KNO3 (potassium nitrate):
KCl + AgNO3 → AgCl + KNO3

Therefore, the overall reaction from FeS to AgNO3 can be represented as:
FeS + 3O2 + 4HCl + 2K2O + 2AgNO3 → AgCl + KNO3 + 2FeCl2 + K2SO3 + 2H2O + H2SO3